Problem validating data
I'm very new to FM...I'm trying to prevent the input of data into a field when a different field is empty. For example when there is no date in the PhotoRetakeDate I want to prevent the inadvertent input of a date in the ProofsSentForRetake field. I can do it at the layout level using a script trigger but I will run in to this in a lot of layouts and want to do it at the Field definition if possible...I can't figure out how to do it in the Validate using a calculation area. Any help will be greatly appreciated...I'm sure this is simple just not simple enough for me yet.