When I add a data to employee.gdb (in frebird/example), it sometimes occur error :

ISC ERROR CODE:335544558

ISC ERROR MESSAGE:
Operation violates CHECK constraint INTEG_30 on view or table EMPLOYEE

STATEMENT:
TIB_Statement: "<TApplication>.frmSQL.frmQuery.qrQuery.<TIB_UpdateSQL>.<TIB_Statement>."


STATEMENT:
TIB_Query: "<TApplication>.frmSQL.frmQuery.qrQuery."

with SQL MEssage :
SQL ERROR CODE:-297

SQL ERROR MESSAGE:
Operation violates CHE

What should I do to correct this error...?

Thanks.



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