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Tax Calculator


Hi, List!

Since I'm novice here, my question may seem naive to you.

First of all: The problem is NOT critical for me.

Does somebody know how BSFN B4001090 (TaxCalculator) works? What
Tables/Fields/Values does it use? Is there any Documentation/Coloured paper or something about it? How and where could I find it?

Thanks in advance for any help.

Oops! :)