>hi!
>
>i am trying to create referential integerity between two tables but whenever i try to do it it is giving me message that first i have to clean up the database but this option is not enabled. how can it be enabled. plz
>
>with thanks

Do a close all then open your DBC exclusively

CLOSE ALL
OPEN DATABASE xxx EXCLUSIVE

Also look in the help at the Valid and Pack commands for databases (DBC files).