Hi , i have some problem... core_preference_text this my table name.Row like "VARIABLE_CODE" VARCHAR2(60 BYTE)" i need write dsl,dslr files related data validation to the table. 1. variable_code should be unieque per enterprise_id 2. variable_code can not be updated give me some suggestion ..how to write dsl,dslr file related two conditions.ASAP.. ===== Chanti