Hello everybody I have two tables in a parent-child relation.
How can I avoid to save a row in the parent table if there is not a row in the child table? If the parent table has a row and the child table has one (or several) rows, it is ok. If the parent table has a row and the child table has not one (or several) rows, reject. Thank you in advance. Walter. [Non-text portions of this message have been removed]
