Firming indicator is not geeting assigned in the partially converted PR

Hi experts,

Firming indicator is not geeting assigned in the partially converted PR in MD04 screen. I checked the Fixed ID mark also in the PR, it also is not marked.

But if changed the delivery date or quantity in the PR manually, it is working fine. In the same way if I converted planned order to purchase requisition (partially), it is working fine.

Materail type : ROH,

MRP type : PD

Rollforward Indicator is 1 (Delete firm planned order).

Release strategy activated for PR.

Please help me to sort out this issue.

Thanks and Regards,

Mohamed Ismail.A