nonrecoverable tax sla doubt

Summary:

we are facing one CVR issue where for non recoverable tax and tax rate variance , cost center must not be default-0000. it must have some cost center.

what would be the invoice distribution account for 1)nonrecoverable tax and 2)tax rate variance.

i am thinking that for tax rate variance , invoice distribution would be PO Variance Account

pls correct me if im wrong.

Also please let me know what would be the invoice distribution account for non recoverable tax(is it PO Charge account or will it come from tax module).

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