Logical filed tests in Filemaker Pro5.5
I want to prevent entry into one filed unless two other fields are empty and vice versa. Basically the logic would be; If Field 1 has entry, Field 2 and Field 3 must be empty. If Field 2 has entry, Field 1 and Field 3 must be empty. If Field 3 has entry, Field 1 and Field 2 must be empty.
I only have an elemetary understanding of field validation and logical operators and don't know how to solve this problem. I also don't have a manual!