In the conditional format, you enter a field, an operator and a value. I am having trouble with entering a null string.
If I enter "". on the final display """" appears, and on running the process, and the field is empty, the expected process does not occur.
Is there a special code for a null string?
I may have found the only solution.
And that is to select the field to be tested, first, then select expression. The right Dialog box will then show the correct format.