Modify Sales order condition types at PGI

Hi Experts,

I have a requirement where I need to update Sales Order Condition type values at the time of PGI.

I have searched but could find user exits to modify condition types but not at time of PGI

Please suggest:

1) Is this possible? At the time of PGI, can the Sales order be edited or will it be in locked state?

2) If possible, please suggest any User exit/BADI for this purpose?

Thanks!

Regards

Vasu Gunda