Buyer not able to change fields of SC in sourcing cockpit in SRM 7.0

Hi

We are on SRM 7.0 , SP 07 . We are in classic mode.

Buyer is not able to change fields of shopping cart in sourcing cockpit like delivery date and quantity . He is able to add supplier and create PO . Even when he creates draft PO , he is not able to edit the fields of shopping cart like delivery date and quantity. Is it a standard Bug , is their any OSS SAP Note for this

Regards

Ashish