Access 2003 form with several controls including following:
1- Payment Type (combo box) that contain three entrees: CASH, Check, Credit
Card
2- Check Number (text box)
Question:
What procedure or code I have to apply and to which event in property of
Check Number Control that if user chose the Check in Payment Type combo box
to be forced to enter a check number into Check Number control before record
could be saved?

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Bardia