Validating a field based on other fields not being empty?
I have a check box that the user clicks to close a work order. When they click the "X" I need a way to validate that they have not left certain fields empty, thus allowing them to close the work order while missing information. I would like an error window to pop up and tell the user that certain fields must be completed before it can be closed. I would assume I would do this as a "Validated by calculation" on the check box field. I just need some help with this calculation, should I use Case? or If?