Item & Discount added in the Sales Order

Question

Dear All,
I have a requirement where in once a Sales Order is created with approved Quotation, then no new extra items to be added in the sales order.
Quantity in the existing line item can be decreased to the lower side but no addition in quantity to be done.
Also no change in discount condition  types to be done.
Please suggest the approprite Config. If there is no standard config, then please suggest the code which needs to be written in the approprite Userexit.
Best solution will be rewarded.
Thanks and regards,
Dilip Kumar Rao

Answer 1

Hi,
To restrict creation of new items and to restrict addition of quantity to existing items, use following user-exits and coding.
Program : MV45AFZB
FORM USEREXIT_CHECK_VBAP USING US_DIALOG.
*{   INSERT         D50K904678                                        1
  if sy-tcode eq 'VA01' or sy-tcode eq 'VA02'.
    check vbap-vgbel <> space and vbap-vgpos <> space.
    read table vvbap with key vbeln = vbap-vgbel
                              posnr = vbap-vgpos.
    if sy-subrc eq 0.
      if vbap-kwmeng gt vvbap-kwmeng.
        message e499(sy) with
          'Quantity entered is greater then referenced'.
      endif.
    endif.
  endif.
*}   INSERT
ENDFORM.
Program : MV45AFZZ
FORM USEREXIT_MOVE_FIELD_TO_VBKD.
  if sy-tcode eq 'VA01' or sy-tcode eq 'VA02'.
    loop at xvbap where vgbel eq space
                  and   updkz eq 'I'.
      exit.
    endloop.
    if sy-subrc eq 0.
      message e499(sy) with 'New Item is not allowed'.
    endif.
  endif.
ENDFORM. 
-Alpesh