Purchase order quantity modification after partial receipt

Hi,

we are using Sage X3 v11 patch 8.

We created a PO for a quantity of 10 for example, then we partially received that PO (received 6 Qty). when we go back to the PO, the system allows us to change the ordered quantity to even less than what was received (to 1 for example). It does give a warning message that a 'Forced pegging' will occur.

can anyone shed some light on what that process is? and if it is possible to prevent the modification of quantity after receiving.

Thanks,

Mahmoud