Hi, I think you'd better reference your store_registration table once by id in the temperature table.
Field('store_registration_id', 'reference store_registration', writable= False), In that way you comply with the rule of single_point-of_definition. The way you define your temperatures table, when a user updates his contact_number it has to cascade to the temperatures table. What you want can be achieved by 'reference store_registration' you could remove the reference and replace it with an IS_IN_DB() validator for instance for Cell_No: IS_IN_DB(db, 'store_registration.contact_number', '%(contact_number)s') and then write your own ON UPDATE CACADE functions Kind regards, Annet -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/web2py/0b0dd14b-9e77-4df2-8ce0-58a00baf0c79o%40googlegroups.com.