Subcontracting reference PO - Sending components thru MIGO

Hi,

While creating a PO 'L - Subcontracting' usually the procedure is:

ME21N - Create PO ('Item L');

MB1B (541 movement)- send the components to the vendor for assembly;

MIGO - receive the final product;

Today, in MB1B I can make a reference to the PO. As I want to make this step thru MIGO there's is no option to reference the PO. In IMG (ENJOY transactions -> settings for transactions and reference documents) I cannot reference the R01 (PO) to the transfer posting A08 for MIGO transaction. Is it really impossible?

Cheers, Garcia.