How to mass assign source of supply to PPDS planned orders

Dear Experts,

PPDS planned orders are created using MMP run in SAP APO. These travel to R/3 via CIF. Sometimes we have a requirement where we need to deactivate IM, delete all planned orders in APO and activate it and again transfer those planned orders to APO.

Now when the planned orders are re-cifed to APO, the source of supply is missing. I can add the source of supply manually through RRP3 tcode.

But is there a way where I can assign PDS Source of supply for all planned orders at once.

The problem is that if source of supply is missing, the sequencing (SEQ1) is not reconginizing these orders fro scheduling.

So, wanted to know if we have any transaction which will update a source of supply to all planned orders at once.

Thanks in advance!