Autoinvoice calculates tax in R12 as we donot want to. How can we turn off tax calculation off for o

We are having issue with invoices that are coming from our Transaction interface table via Auto invoice.

Our invoices that are coming from our source system has already tax calculated on them from the source system. We do NOT want Autoinvoice process calculate tax

for invoices in the Transaction interface. 

How can we set the Tax calculation off in our R12 Receivable application to NOT calculate tax?

Note: We have enable configured our R12 with required eBIZ Tax configuration. We have have our R12 Receivable integrated with our Tax vendor Taxware.

         We only need to calculate tax for our R12 credit memo transaction. The tax calculation should be turned off for all other R12 receivable trasnaction types.