Return Code	Significance
0	no error
1	zero pointer
2	function name not in userexit list

The edit_action-userexit is called before an edit operation is executed in the mask (insert, update, query).

Any required application parameters must be passed together with the name of the userexit in *xea. In order to delete an userexit already set, you must pass an empty string.

The function automatically invoke any set mask listener function.