Diagnosis
Removing relationships with the relationship type Leading orQualifying is not allowed, since it causes key fields to bedeleted in the generated database tables. You can remove otherrelationships, however.

System Response
If you have tried to remove a relationship with Leading orQualifying as the relationship type, there is a loss of data whenthe database tables are regenerated.
If you have tried to delete another relationship, the correspondingnon-key field is deleted from the generated database table. The data inthe non-key field is lost.

Procedure
Check if there is already master data stored in the generated databasetables.
Check if the relationship you want to remove is a Leading orQualifying relationship.