In the standard CCS scenario it is not foreseen to have the tax code (which was automatically determined by Pricing, from the tax condition record) changed manually in WZR2.
Even though there is a customizing setting for the settlement process type (TMZR-TAX_CODE_DETERM) to do a manual and automatic tax determination. It's still not enough for it to work the way you expect the system to work which is to be able to overwrite the tax code.
If you want to make the system to determine the tax code based on both (automatically determine the tax code and at the same time allow the user to manually overwrite the tax code), you have to change the pricing procedure or use a different pricing procedure that uses a combined condition records such as tax trigger plus reference condition and access sequence which will allow the system to automatically derive/determine the tax code thru condition technique and at the same time allow the user to manually overwrite the derived tax code.
But this involves choosing the proper condition types and formulas to be used in the pricing procedure. Therefore, you have to do proper customizing and for proper configuration of the condition types and formulas of the pricing procedure to meet your business expectations.
If you still wish to have the ability to change the tax code manually for a CCS-related credit memo, that has to be done through a custom project, by a Consultant who can ensure that all your business requirements are done in an optimal manner.
Best Regards,
SAP Product Support
Bluesky
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