Hi ,
What do mean by the quality clauses ? Are they the Purchase conditions being imposed by the company over the material ? Or specifically the quality charecters of that material like color , temparartue etc kind of thing? Normally what ever may be the condituons , once you provide a PO to the supplier with some conditions , you need to bear the same till the delivery completion cycle of that PO . Isn't it ?
You are telling that in between they are getting changed and during the GR they are being printed which might be differenet during the time of PO .
If your problem islike different conditions being at PO and at GR , and you managed though ABAP coding , you modify the coding with conditions of change .
Regards,