The tax field in CAT2 is used in the Work Tax Area Override functionality. As I recall, there are related processing classes to maintain. We implemented this years ago and works well - no need for a custom program, but I do believe there may have been a BAdI to implement and possibly a rule. It's been awhile and it depends on how you want to use it. Found good documentation on it in SAP. Try doing a search on Work Tax Are Override or WTAO in the knowledge base articles. Good luck!
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