Issue while setting GR indicator in PO change BADI

Hello Experts,

I am working on SRM 7.0 extended classic .

There is a scnario where in the PO is created using created shopping cart number via report BBP_SC_TRANSFER_GROUPED during this report execution the implementation for BBP_PO_CHANGE method of the BBP_DOC_CHANGE_BADI BADI is getting executed.

( In the BBP_PO_CHANGE method I am setting good reciept indicator field ( GR_IND )at item level based on some conditions .

I have written the below code

data: it_item1 type table of BBP_PDS_PO_ITEM_D,
          ls_item_i TYPE bbp_pds_po_item_icu,
          ls_item TYPE bbp_po_item_badi.
    data  v_indicator type ZNONGR_INDICATOR.

    if IT_ITEM is not INITIAL.
*      refresh et_item.
      loop at IT_ITEM into ls_item_i.
        clear: v_indicator,
               ls_item.

        select SINGLE NON_GRINDICATOR
               from ZNON_GRINDICATOR
               into v_indicator where PRODUCT_CATEGORY eq ls_item_i-CATEGORY_ID.
        if sy-subrc eq 0.
          if v_indicator is not INITIAL.
            clear ls_item_i-GR_IND.
          else.
            ls_item_i-GR_IND = 'X'.
          endif.

          MOVE-CORRESPONDING ls_item_i TO ls_item.
          APPEND ls_item TO et_item.
          CLEAR ls_item_i.
        endif.
      endloop.
    endif.

).

I am getting out put error as 'Please clear the price or set the "Invoice expected" indicator' .

If I comment the part of the code below

if v_indicator is not INITIAL.
            clear ls_item_i-GR_IND.
          else.
            ls_item_i-GR_IND = 'X'.
endif.

This error is not comming. Please suggest where I went wrong.

Thanks & Regards,

Murthy