>In VFP5 the referential integrity is enabled but in 6.0. SP3 it is disabled. It just came to knowledge a while ago when I tried fine tuning one of our existing projects. Did I missed something. We just started to 6.0. when SP3 was released.

Jess,

OPEN DATABASE MyDBC EXCLUSIVE, or change the default for exclusive in the tools options dialog. You cannot edit RI if the database is opened shared.