Priority in PP/DS PDS not working as expected

We have 2 production versions A and B for product X both ion plant location 1000.

We want system to select PDS A by default.

So, I went to transaction PDS_MAINT for material X in ECC and maintained Priority 1 for production version A and Priority 2 for production version B at header level.

I did CURTO_CREATE in ECC to transfer priority information to APO. I checked and found priority information in APO.

When I create sales order material X in ECC and executed product heuristic in APO, planned order created has PDS B.

I expected planned order to have PDS based on priority.

Can you pl let me know if I am missing something?

Thanks,

Srini