Changing Item Values before saving Purchase Requisition in me51n, set_data function

Hello,
        I have written a user exit, which is called whenever changes are made to a purchase requisition. User Exit is MEREQ001 , function module EXIT_SAPLMEREQ_010 . My requirement here is that the Requisitioner should be 135 for every PR item under certain conditions. Therefore whenever there is any change made to the PR, before saving the PR item, I need to set the Requisitioner to 135, give a status message saying that the Requisitioner is set to 135 and save the Pr with the changed values. Following is the code I have written in EXIT_SAPLMEREQ_010. However, the set_data function called below does not change the PR values. Pls help
data: lt_item type mmpur_requisition_items,
       wa_item type mmpur_requisition_item,
       wa_itemdet type mereq_item,
       wa_itemref type ref to if_purchase_requisition_item,
       w_message type i.
constants: c_135 type afnam value '135'.
call method im_req_header->get_items
     receiving
             re_items = lt_item.
    loop at lt_item into wa_item.
     wa_itemref = wa_item-item.
     wa_itemdet = wa_itemref->get_data( ).
     if wa_itemdet-afnam ne c_135.
       w_message = 1.
       wa_itemdet-afnam = c_135.
       call method wa_itemref->set_data( wa_itemdet ).
     endif.
   endloop.
IF w_message = 1.
    MESSAGE 'Requisitioner defaulted to 135 for all items' TYPE 'I'.
ENDIF.

Hi Sachin,
I am able to get a reference to if_purchase_requisition_item in my code (wa_itemref ) and am also able to access each of the line items in the PR in the work area wa_itemdet.
At this point in the code ( wa_itemdet-afnam = c_135 ) , the work area value is set to '135', However, call method wa_itemref->set_data( wa_itemdet ), does not change the values of the work area wa_itemdet . Pls help

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Changing Item Values before saving Purchase Requisition in me51n, set_data function

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