Intercompany invoices need to apply modifiers

Hello,

We have a scenario where OU1 is creating a Sales Order where the sourcing warehouse is in OU2.

So we are creating intercompany invoices in OU2.
We are not creating any internal sales order in OU2, we have setup intercompany shipping flow and running 'Create Intercompany AR Invoices' from inventory responsibility of OU2.There was a price list setup in OU2 and that is attached with the customer site.

We want an additional modifier to give some discount/additional charges on the price list unit price,but the intercompany invoices are generated with pricelist price,though the modifier was setup.