R48120 Processing - Materials Issued to Work Orders

I created a work order and issued materials to it. Posted the batch and the transactions show in the F0911 with a billing code (BC) = I (Ignore) and R48120 won't process these transactions. Does anyone know how to prevent the "I" from being populated?

I tried using P4112 to do the issue using the work order number as the subledger and subledger type = W and it works fine.

Thanks