As of ABAP release 7.0 EhP2: Pragmas or Program Directives can be used to hide errors and warnings from check tools, the Abap compiler syntax check and the extended program check (but not the code inspector - I'm afraid). Pragma's have no effect (affect) on the actual program flow. A pragma is very simlilar to a compiler directive, and pragma's and compiler directives should not be used together. They can be mixed, but it confuses the h.ll out of people. The pragma is the official successor of the compiler directive, which should no longer be used.
A pragma is structured like this:
Not case sensitive, no spaces. The code specifies the effect and the optional parameters (the  brackets are not optional) may further limit the effect. Report
ABAP_SLIN_PRAGMAS lists available pragma codes. If you find (like me) that the report is not very helpful, try transparent table
SLIN_DESC which holds a bit more information, along which an English description (field
SLIN_DESC table holds settings which are used by transaction
SLIN Code inspector. The error level and todo-priority can be adjusted according to customer needs (use
SM31 to apply changes if needed). Entries on this table can be grouped by key (field
ID which are listed on table
An example use of pragmas:
DATA lv_text TYPE STRING ##needed. lv_text = 'Hello Pragmas' ##no_text.
With a parameter the pragma can be made more specific (identifying the actual parameter the pragma is for):
DATA lv_text TYPE STRING ##needed[lv_text].
Which would make more sense as
DATA: lv1, lv2, lv3, lv4 TYPE STRING ##needed[lv2].
Overview of practical pragmas:
AUT Authorizations A AUTH_FLD_MISSING Authorization Field Missing A AUTH_OBJ_OK Authorization Object not Entered in the Table TOBJ A AUTH_FLD_NO Wrong Number of Authorization Fields A AUTH_DOM_VAL_OK Authorizations: Fixed Vals for Domns Falsely Entered for ID A AUTH_FLD_LEN Authorizations: Field Length Too Long C NOCOMMENT Authorizations: Field is duplicative BRE Superfluous Statements A NO_BREAK BREAK-POINT Statement C NEEDED Obsolete statement SYNTAX-TRACE C NEEDED Statement for runtime/performance measurement B NEEDED Redundant statement (e.g. Var1 = Var1 ) C NOCOMMENT Statement contains only a Dot A STMNT_EXIT Statement after EXIT/STOP/RETURN/RAISE/SUBMIT cannot be reached C NOCOMMENT Pseudo comment without effect C NEEDED Macro-Definition not be used B CALLED Method will not be called C NEEDED Duplicate macro definition B NEEDED Statements for a FORM missing (empty unit, obsolete object ?!) C FS_UNTYPED Untyped field symbol B DO_OK No exit for DO-loop / no leave of loop C NEEDED Statements between DO - ENDDO missing (endless loop, undefined result,..?!) A NOCOMMENT Report Event out of Report C NEEDED Report Event out of Report B NEEDED Statements for method missing B NEEDED Statements for function module missing (empty unit, obsolete object ?!) B NEEDED Statements for dialog module missing (empty unit, obsolete object ?!) B NEEDED Statements for macro missing C NEEDED Statements between TRY-ENDTRY missing C NEEDED Statements between WHILE-ENDWHILE missing (performance, endless loop,..) C NEEDED Statements between LOOP-ENDLOOP missing (performance,..) C NEEDED Code between SELECT-ENDSELECT miss.(performance, uncontrolled result,..) C NEEDED Statements between IF--ENDIF missing C NEEDED Statements between ELSE-ENDIF missing C BOOL_OK Condition is redundant B BOOL_OK Condition is always true B BOOL_OK Condition is always false C BOOL_OK Condition is redundant C BOOL_OK Condition is redundant C BOOL_OK Condition is always true B BOOL_OK Condition is always false C BOOL_OK Condition is redundant CAL CALL FUNCTION Interfaces A EXISTS Called up function module does not exist A FM_PAR_MIS Function Module Parameter Is Not Called A ARG_OK Function Module Parameter Missing A EXCEPT_TRY Class-based exception is not handled A FM_OLDED Called function module marked as "obsolete" B NOCOMMENT Update function module called with useless parameters A FM_SUBRC_OK Access to Undefined Return Code After CALL FUNCTION B FM_SUBRC_OK Return Code of FM-EXCEPTION ignored (use exception xx = 0 or Code IF RC...) B NOCOMMENT Wrong order for asynchron RFC addition A NOCOMMENT Asynchronous RFC with Empty DESTINATION Clause A FM_UPDATE_OK Update Module with Invalid Statement B FM_RAISE_OK For RAISE-statement the related EXCEPTION is missing in function module B EXCEPT_OK EXCEPTION in FM has no RAISE in function group B FM_UPDATE_OK Function module is no update module B FM_RFC_OK Function module is not a RFC function B FM_DEST_OK RFC with incorrect DESTINATION Specification A NOCOMMENT RFC with Incorrect TASK Specification A NOCOMMENT RFC with Incorrect GROUP Specification C FM_NO_TYPE Missing type declaration of "formal" parameter B NOCOMMENT RFC with incorrect Argument Call C RAISE_OK No use of MESSAGE RAISING B NOCOMMENT Source for function module missing in function group B NOCOMMENT Usage of syntax: KEEPING LOGICAL UNIT OF WORK B IS_SUPP_OK IS SUPPLIED used for a parameter of a remote function module C FM_EXCEPT_OK Name of EXCEPTION starts with CX A ARG_OK Function Module Exception Missing B NOCOMMENT RFC without RFC specific exception B NOCOMMENT asynchronic RFC with application specific EXCEPTION B NOCOMMENT RFC without Exception Handling B NOCOMMENT RFC use for an Application Exception a System Exception B NOCOMMENT RECEIVE Statement with EXPORTING Clause A NOCOMMENT Warning of Syntax Check with Very High Change Priority DAT Field Attributes A SEARCH_HELP_OK Undefined Search Help A FS_ASSIGN_OK Field-Symbol not assigned A VALUE_OK Initial Value Too Long for Field Type A NEEDED Reference is not written B FIELD_HYPHEN Field name with "-" (no Dictionary) B NEEDED Unused fields B NEEDED Unused TYPE Pool B NEEDED No read for fields B NEEDED Field symbol not used C NEEDED Unused Field (Include is shared) C NEEDED No read for fields (Include is shared) C FLD_TYPE_NAME Misleading field name B SECTION_OK PROTECTED SECTION in final Class C CLASS_FINAL Class is final A TIME_ARITH Calculations with Time Stamp Fields B TIME_ASSIGN Assignment for time stamp field B TIME_COMP Comparison of time stamp field C NEEDED Reference (without instance access) not written C NEEDED SY-INDEX used out of WHILE/DO iteration C ASSIGN_OK Write access to a non writable field B NEEDED Type has no Use B NEEDED Lokale Klasse wird nicht benutzt DYC Dynpro Consistency B NOCOMMENT Errors in screens B CALLED Errors in screens B NOCOMMENT Screen number field is not of type N ESY Test Environment A NOCOMMENT Program contains syntax errors A NOCOMMENT Program contains generation errors A NOCOMMENT Internal Error: program contains scan errors A NOCOMMENT Internal Error: SCAN WITH STRUCTURE Is Inconsistent A NOCOMMENT Program contains space characters A NOCOMMENT The function module definition has no TFDIR entry A NOCOMMENT Program with invalid namespace A NOCOMMENT Program source text cannot be read B NOCOMMENT Function group has not program type F (->attributes) A NOCOMMENT Program contains inconsistent time stamp A NOCOMMENT Programm source cannot be analyzed A NOCOMMENT Program package has no TDEVC entry A NOCOMMENT Program has no Object Directory entry C NOCOMMENT Duplicated Call of SET EXTENDED CHECK OFF C NOCOMMENT Call of SET EXTENDED CHECK ON missing A NOCOMMENT Pseudo comments contains unvalid character (for space) A NOCOMMENT Program contains inactive program INCLUDES B NOCOMMENT External referenced Program contains syntax errors A NOCOMMENT Invalid test program (INCLUDE or no TRDIR entry) A NOCOMMENT Cannot change program in current system B NOCOMMENT Exchange SET EXTENDED CHECK with pragmas A NOCOMMENT Program has a transport mismatch A NOCOMMENT Internal Tool Error: ASSERT Condition Violated GES SET/GET Parameter IDs A GS_TWENTY GET/SET Parameters: Field Length Too Long A EXISTS GET/SET-Parameter Not Entered in TPARA HEL Programming Guide Lines B NOCOMMENT EXIT Statement out of a LOOP C NOCOMMENT CHECK Statement out of a LOOP B NOCOMMENT Possible Read Access before Write Access C NOCOMMENT CHANGING parameter has no write access C NOCOMMENT Use of a numeric literal B NOCOMMENT Unicode checks are inactive B NOCOMMENT Fixpoint arithmetic is not active B NOCOMMENT No valid mathematical notation B INCL_OK Include is shared B NOCOMMENT Use of a non class bases exception B NEEDED Program uses global fields B NOCOMMENT Program uses the TABLES statement C NOCOMMENT EXPORTING parameter has no direct write access C NOCOMMENT EXPORTING parameter has no write access C NOCOMMENT IMPORTING parameter has no read access LOA Check Load Sizes A NOCOMMENT Potential Generation Bottleneck: Load Table Over 98% Full A NOCOMMENT Potential Generation Bottleneck: Load Table Over 90% Full MES Message A MG_MISSING T100 MESSAGE Not Defined A MG_MISSING MESSAGE call contains the wrong number of WITH parameters B MG_ARG_LEN MESSAGE-parameter too long B MG_USER MESSAGE within customer namespace A MG_MIS_ATT Missing Attribute in Exception Class for T100 Message B MG_WRN_ATT Wrong Attribute in Exception Class for T100 Message MLS Internationalization A STRING_OK Character String in Source Code Contains Invalid Characters A DATE_FORMAT Not all supported date formats are handled A DATE_FORMAT It is possible that not all supported date formats are handled B TEXT_CHAR Text element ends with "Umlaut" (unvalid character within unicode) MOD Modifications B NOCOMMENT Modification Assistant bracket structure is inconsistent NOC No Use OPF Output CURR/QUAN Fields A UOM_IN_MES Display of CURR Field Without CURRENCY Addition A UOM_IN_MES Display of a UNIT Field Without a UNIT Addition B UOM_IN_MES Output of UNIT-Field without UNIT-addition with DECIMALS PAC Package Check PER PERFORM/FORM Interfaces A PERF_NO_FORM There is no subroutine for this PERFORM call A PERF_NUM_ARGS Wrong number of parameters for this PERFORM call A PERF_TABLE_CATEGORY Undefined TABLES Parameter for This PERFORM Call A COMPATIBLE Formal Parameter Incompatible with Actual Parameter A PERF_INCL_OK External PERFORM in an INCLUDE A COMPATIBLE STRUCTURE Parameter too Short for the Formal Parameter A LIT_COMPATIBLE Literal Incompatible with Formal Parameter A NOCOMMENT Program source text cannot be read B PERF_CAT_OK Parameter categories do not match (USING/CHANGING) B CALLED FORM not be called B PERF_GLOBAL_PAR_OK FORM-Parameter will also be used globally C CALLED FORM not be called (Include is shared) C PERF_NO_TYPE Missing type declaration of "Formal" parameter A NOCOMMENT Warning of Syntax Check with Very High Change Priority B PART_OK COMMON PART definition is different PFS GUI Status and Titlebar A STAT_UNDEF GUI Status Not Defined A TITL_UNDEF TITLE not Defined B NOCOMMENT STATUS-definition in Formpool B NOCOMMENT SET TITLE call in Formpool C STAT_PROG Program without GUI-Status PUT Cross-Program Checks B CONST_WRITE Constant overwritten A CURSOR_LOST SELECT Loop contains statement that destroys cursor C CURSOR_LOST SELECT-Loop with PERFORM-call (potential Cursor lost) B LIT_INCOMP Character/Literal transferred to incompatible parameter C NOCOMMENT INCLUDE not used A LOOP_ASSIGN Use of ASSIGN or UNASSIGN on field symbol forbidden C NOCOMMENT Includes of class are obsolete -> SE24/SE80 cleanup class includes A NOCOMMENT text element longer than the formal parameter SEC Security Checks A NOCOMMENT Hard coded username B NOCOMMENT User-dependent program flow A NOCOMMENT Possible SQL injection A NOCOMMENT Possible Directory Traversal A NOCOMMENT Possible system command injection A NOCOMMENT Possible ABAP command injection A NOCOMMENT Possible SQL injection A NOCOMMENT Possible SQL injection B NOCOMMENT Possible SQL injection B NOCOMMENT Possible SQL injection A NOCOMMENT Possible SQL injection A NOCOMMENT Possible SQL injection A NOCOMMENT Possible SQL injection via Object Services A NOCOMMENT Possible Directory Traversal vie File Utilities class A NOCOMMENT Possible SQL injection via ADBC (DDL) A NOCOMMENT Possible SQL injection via ADBC (DML) A NOCOMMENT Possible Cross Site Scripting C NOCOMMENT Possible Response Header Tampering C NOCOMMENT User controlled dynamic object creation C NOCOMMENT User controlled dynamic procedure call A NOCOMMENT User controlled dynamic program unit call C NOCOMMENT User controlled dynamic transaction call C NOCOMMENT User controlled dynamic transaction call B NOCOMMENT Usage of an obsolete Escaping method A NOCOMMENT In Tag htmlb:content the attribute forceEncode="enabled" is missing A NOCOMMENT In Tag htmlb:content an obsolte Design is specified, or none at all A NOCOMMENT AUTHORITY-CHECK without processing of sy-subrc A NOCOMMENT Call of System Function CALL 'SYSTEM' A NOCOMMENT AUTHORITY-CHECK for specified User A NOCOMMENT SUBMIT for specified User C NOCOMMENT The dynamic WHERE condition allows a potential code injection. A NOCOMMENT Authority Check before CALL TRANSACTION STE Structure Enhancements A NOCOMMENT Structural Enhancement by Customer (Very Serious Problem) A NOCOMMENT Structural Enhancement by Customer (Serious Problem) A NOCOMMENT Structural Enhancement by Customer (Medium-Priority Problem) B NOCOMMENT Structural Enhancement by Customer (Low-Priority Problem, semantic change) SUB External Program Interfaces A TSTC_MISS Transaction Code not Entered in TSTC A SUB_PAR SUBMIT Parameter Does Not Exist A SUB_SELOP SELECT-OPTION Missing for SUBMIT Parameters A TDCT_MISS Dialog module is not entered in the TDCT A SUB_NO_REP Report called using SUBMIT is not Type 1 A USER_SMOD User Exit Enhancement Missing A USER_FM Function Module with Interface Missing in Func. Group (X..) B USER_FM FM is not deactivated by TMOD/SMOD A SUB_FR_SEL Report called using SUBMIT has no dynamic selections TXT Character Strings A NO_TEXT Text Element Missing in a Character String A TEXT_POOL Text Element not Defined in Text Pool B TEXT_UNIQ Different character strings with same Text element-ID B TEXT_DIFF Text element vs. program defined different B TEXT_USE Text element not being used (translation effort !) B SHARE_OK Text element within shared INCLUDE B NOCOMMENT Unnecessary selection text C SEL_WRONG Selection text not yet maintained A NOCOMMENT Text Pool Inconsistent C NO_TEXT For a character string the text element is missing C TEXT_DUP Character Literal with duplicate text element UNR Problematic Statements A WHEN_DOUBLE_OK CASE Statement with Identical WHEN Conditions A LOOP_AT_OK LOOP with WHERE/TO condition contains an AT (Warning) A LOOP_TO_OK The TO limit in the LOOP is overwritten in the loop body A PREFIX_OK Name begins with a reserved prefix '%_' A FREE_MEMORY_OK FREE MEMORY Statement Without ID Entry A INCL_TYPE_OK INCLUDE Program Is Not Type I A WHEN_CHAIN_OK WHEN Statement Written in Chained Statement B NO_HANDLER Exception handling is empty A NO_HANDLER Exception Handling Empty A STOP_IN_MODULE STOP Statement in MODUL Definition C CATCH_ALL Exception handling with CX_ROOT B WRITE_OK SY-Field overwritten A NO_HANDLER Exception Handling Empty B DECL_EVENT Declaration within event B STR_NUM Unnecessary conversion CHARACTER-LITERAL (String, Text,..) to INTEGER A LOAD_STMNT_OK LOAD-OF-PROGRAM Event with Invalid Statement B DUPL_EVENT Duplicate definition of program event B RAISE_NO_FM RAISE-statement outside of function group B NEEDED EXPORTING-parameter not be used/called A STOP_IN_FM STOP Statement in Function Module B MODUL_IN_POOL MODULE-statement in FORM-POOL B GEN_OK Unnecessary Generic ("Generizität") B ENDLESS_CALL Procedure calls have an endless loop B NOCOMMENT Default CASE is a Literal (String, Text,..) C ASSIGN_LEN ASSIGN above field limit C DECL_MODUL Declaration in Module (Offset w/o Length definition) C WRITE_MOVE WRITE TO statement can be replaced by MOVE C LOOP_AT_OK LOOP with FROM-restriction contains AT (Info) C BLANK_OK Comparison ignores closing spaces A WRITE_OK Important SY Field Is Overwritten B TYPE_CHAIN_OK Missing type definition within a chained statement C TYPE_CHAIN_OK Missing type definition within a chained statement (_N) B SUBRC_AFTER_COMMIT Handling of SY-SUBRC after COMMIT WORK B NOCOMMENT CONNECTION name without braces B NOCOMMENT CONNECTION name without braces B NO_HANDLER Exception handling is empty for CX_.. B NO_HANDLER Exception of category CX_NO_CHECK not handled B NO_HANDLER Exception of category CX_DYNAMIC_CHECK not handled B NO_HANDLER Exception of category CX_STATIC_CHECK not handled B SUBRC_READ Reading of SY-SUBRC without Setting C CHAIN_OK Dubious Chained Statement A SAPRL_OK Compare of SY_SAPRL with an Integer field A NOCOMMENT Important SY Field Is Overwritten B INCL_OK INCLUDE without statements/code C INCL_OK INCLUDE with only one statement (only comments,..) A LOOP_INDEX Index Access to Internal Table Outside a LOOP C LOOP_INDEX Index access to internal table outside LOOP (within FORM) A INDEX_NUM Non-Numeric Index Access to an Internal Table A NOCOMMENT Changing Access on Internal Table with Control Level Processing B NOCOMMENT Changing Access on Internal Table with Control Level Processing WOO Outdated Statements B NOCOMMENT Command raises syntax error within ABAP-OO context B NOCOMMENT Command raises warning within ABAP-OO context C NOCOMMENT Command raises serious warning within ABAP-OO context WRN Syntax Check Warnings A NOCOMMENT Warning of Syntax Check with Very High Change Priority A NOCOMMENT Warning of Syntax Check with High Change Priority A NOCOMMENT Warning of Syntax Check with Medium Change Priority B NOCOMMENT Warning with medium priority B NOCOMMENT Warning with medium priority (no pseudo comments) +95 more