Cost VPRS in 3rd Party TAB scenario

Hi,

we are using 3rd party processing for some of our materials. In this case sales order triggers the purchase requistion and hence purchase order. Then for TAB, do MIGO and then we post invoice verification for this GR. Then we create delivery and finally billing to customer. Now the problem is that in Billing, VPRS is still taking the value of Sales order VPRS value Hence the cost appearing in Billing is not accurate.

Hence the profit margin calculations are not correct.

Can anyone suggest the way to populate the value of MIRO in VPRS while billing?

Interestingly, when using TAS scenario, we are getting the MIRO cost in Billing into VPRS but not so for TAS...

Thanks