I am developing a DB and I am faced a problem in one of my forms. The form name is FrmSales. It contains a subform named "frmSalesSubform".
The problem is that when i start entering data in the subform before going to the parent form, by the time i go to the parent form, the data in the sub form disappears and updates the table.
What i want is a code that can force the subform to be inactive until a field in the parent form is Not Null.
Thanks in advance.