Brian Dunning's FileMaker Custom Functions

CheckdigitDammVerify ( digitSequence )

Verifies a digit sequence containing a Damm check digit

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Jeremy Bante   Jeremy Bante
Beezwax Datatools, Inc.

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  Sample input:
CheckdigitDammVerify ( 12345 & CheckdigitDamm ( 12345 ) )
  Sample output:

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Verifies that a digit sequence ending with a Damm check digit has been transcribed correctly.

This custom function implements an algorithm described by H. Michael Damm in



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Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

Under construction. Email me your wish list for improvements.