Hello, Larry -
This is very bazaar since in my experience, BSI returns error messages when the SAP tax code is passed and no mapping exists. So in the BSI interface that SAP builds the ADC TC: will have the two to four character code and that is used by BSI to determine the tax authority via the mapping in BSI. So I am curious what the BSI interface looks like prior to the call to BSI. I am also curious as to what the BSI Messages and Status has after the call is completed.
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Just to see what would happen in our test system, I removed the mapping for IN05 and ran an employee with IN05 set as residence tax area. I got the following in BSI Messages and Status:
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All other taxes processed as expected - FED and IN - but the only WT's generated for IN05 are the /3xx, /6xx and /7xx.
So this is the standard but maybe you have something custom that is happening for the BSI interface.
What ever you do, do not click on the "create default mapping" for tax types or tax authorities.
I also ran the sync tool to see what would happen - I got that there are no missing mappings. HA!
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Hope this helps but it seems you have opened a can of worms... But at least you don't owe me a lunch. Darn!
Best regards, Anna