What you should do and not do where data integrity is involved...
- Do Check the 7 sins of Data Integrity
- Don't Blow holes in SAP's data integrity
- Do Value data integrity - it's all the system is about
- Don't Under-estimate what ignoring data integrity can do to your system. At some point the system will be branded "unreliable" (which is worse than "down" as a system that's down can be back up again soon)
- Do Check out how much custom coding is in your system... See the article on sizing