>Whenever I try to add referencial integrity rules to my database with the referencial wixard, I get the message ".DBC internal consistency error" and the message keep poping up until I kill VFP with the task manager. Naturally, my DBC is screwed-up after that and I have to restore it from the backup.
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>Is there any way to add the referencial integrity rules to my database without writing the code myself?

Yes. Make sure to always PACK DATABASE before re-building RI.