IsValidReturns 0 (False) if:
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• FileMaker Pro cannot locate (temporarily or permanently) the related table in which the referenced field is definedOtherwise, it returns 1 (the data is valid).IsValid(Datefield) returns 0 if there is non-date data in Datefield, for example if text was imported into it.IsValid(Amount) returns 0 if there is only text in the number field Amount.IsValid(table::field) returns 0 if the related table was renamed and the relationship isn’t updated with the new filename.