Invoice Receipt Warning Message Appear After Upgrade from 4.6C to ECC6

Question

Hi Gurus,
We do upgrade from 4.6C to ECC6. And we do Invoice Verification base on Delivery (Vendor delivery number), in our business process there more than one Purchase Order has same Vendor Delivery Number while GR executed. But only one Purchase order related to Invoice verification, others PO are Free PO (no need Invoice Verification).
The problem is:
In SAP 4.6C, while execute Invoice base on Delivery (Vendor delivery), system automatic select only PO with Delivery (vendor) which related/allow invoice receipt.
In SAP ECC6, while execute Invoice base on Delivery (vendor delivery), all PO selected. So than there are warning messages appear (warning pop screen) for those PO not allow invoice Receipt (message M8035: PO item XXXXX does not allow invoice receipt), and at the end PO which allow Invoice receipt then appear for further Invoice Receipt process.
At overall, the final result SAP 4.6C and SAP ECC6 is same (only PO which allowed Invoice Receipt will processed further).
The Question are:
1. Why in ECC6 appear warning message, while in 4.6C no warning message ? Is there config to ignoring the warning message. I've try to maintain system message for M8035 (t-code: OMRM) to ignoring the pop screen, but can not created.
2. How do we make warning message dissapear (no need warning message), because if the PO's has hundred items so user need to click enter hundred times.
Thanks in advance.
Regards,
Tri Wicaksono

Answer 1

Hi,
could you please check whether the flag "GR-based IV" is set in the purchase orders?
If GR based-IV is ticked, then this pop-up cannot be suppressed.
If you would like to post the invoice first then GR-based IV should not be checked, otherwise this pop-up will always appear.  I am afraid that this behaviour is standard. 
Please, be aware that this feature is only available if you set  in the Purchase Order item the 'GR-based IV' indicator:
   If the GR-IV flag is not set in the PO, then the system does not                     
   differentiate individual goods receipts. Please see the <f1> help                    
   for the field "GR-IV" in the PO item detail. Since the individual                    
   receipts are not differentiated, an invoice is not tied per se to                    
   an individual receipt and a goods receipt can be reversed despite                    
   an invoice receipt.                                                                               
With the GR-IV flag set on in a PO, you can specify which goods                      
   receipt is being invoiced in an IR and which goods receipt is being                  
   reversed in a return. It is this correlation between goods receipts                  
   and invoices that enables you to specify for GR-IV PO's whether an                   
   item can be returned despite an invoice. 
Please refer to the note :457511 Question 10.          
Best regards
Erika