Hi Raymond,
Thank you replying.
I'm explaining you my full requirement, When user create PO using ME21n with Document type NB and material type ROH that time system check RFQ number; When RFQ number is not available then system trough an error.
So according that I'm using badi ME_PROCESS_PO_CUST and method PROCESS_ITEM
Also check my below code and suggest me where we need to correct this.