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The ACCOUNTS program was very carefully programmed to protect you against silly errors which can cause big problems in the future. (Referential integrity is just a fancy Computer Science term for making sure that data in all of your related data files matches up sensibly.)
The following are a sample of some of the things that are never allowed in ACCOUNTS, to ensure referential integrity:
All of these are prevented at the database level, so even if there was a bug in the program that allowed you to try to do one of those actions, the database would not allow you to do it.
Many other actions that don't make sense are prevented at the program level, although the database might allow them.