PS 9.1 Billing - tax in the billing interface
We are upgrading to 9.1 and we are facing an issue with the Billing Interface.
We have interfaces coming from external systems to BI module which carry TAX amounts from these systems.
There is also a TAX rate in the billing interface tables, however it should not be used for calculation as TAX amount from external system should be the leading point.
But the finalization process in BI always recalculates TAX amounts based on TAX rate.
My question is: Is there any way that TAX amount should be the most important for interfaces and not to allow system to recalculate TAX amount using TAX rate?