Subcontracting PM order component requirement quantity change

Hello,

After creating subcontracting PM order, reservation and purchase requisition has also created for component.

In this time, I can change component requirement quantity as I want.

But after createing purchase order by ADSUBCON on the PR, requirement qty of the component of this PM order can not be editable anymore.

When I checked the previous system based on ERP 4.7 version, the component requirement qty can be changeable regardless of the PO creation.

I want to change the component requirement qty without restriction.

Please let me know what is the configuration of this difference or how I can solve this situation.

Thanks in advance.