Update supplier/supplier site on BPA - EBS R12

Hello,

we are implementing PO catalog in our organization, so as part of setup and testing I created a blanket purchase agreement (BPA) for a specific supplier and supplier site, uploaded items and got it approved as well.

While creating requisition for these catalog items I realize that I have the wrong supplier site info on the BPA, now when I try to go back and edit supplier site info on the BPA it is non-updatable.

My question is how do I edit supplier info on the BPA. any inputs would be greatly appreciated.

Thanks

Kiran