A simple solution would be to stop using some half-assed, unstructured software for data. Save the file to CSV so that the formulas are resolved, then write a datastep import which reads the data as per the agreement you have with the vendor. If there are invalid data in there, i.e. they do not conform to the structure document, then send the file back and ask source vendor to supply a corrected file, or update the transfer specifications. The problem is no transfer specifications/agreement and an unacceptable transfer format, much like every question raised on Excel use
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