The attribute is cash received.
I need the user to enter the exact amount of cash received and since there is no 1c or 2c in Australia only 5c, I want validate the user input & REPORT ERROR if user enters $10.57 and tries to save the form.
The cash received cannot be round up to $10.60 if the user only received $10.55.
I'll try to use to use the MOD and ABS functions & see how I go.