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Hi: I have the following problem when trying to validate the data of a record in an Interbase table. At the time of the Post, valid if one of the fields you are entering is Null or less than 0 (zero). I evaluate if it is null using the IsNull function, the problem that if you enter 0 (zero) in the registry the IsNull function returns False when it should be True. I've already tried using the Permanent Field format or using the FielbByName function and the result is the same. It is important to add that the 0 can be a valid value, not the Null value. I am working with Delphi Tokyo and Unigui version 1.10.0.1471. Any idea how to fix this?. Thanks in advance for your help
