ISBN13Check ( ISBN13 ; text )
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Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
For booksellers and others who need to validate their 13-digit ISBNs during data entry, this function checks a number against the industry calculation for ISBN13s and outputs a warning message of your choice if validation fails. I recommend nesting the TextColor () function in the second parameter to make the warning message more eye-catching.
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