R PURCHASINGSOURCELISTTP

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 DATA lt_selection TYPE TABLE FOR READ IMPORT r_purchasingsourcelistitemtp.
 
 lt_selection = VALUE #( ( sourcelistrecord = 00001
                           material = '000000000000000001'
                           plant    = '1990' ) ).

 READ ENTITIES OF r_purchasingsourcelisttp 
  ENTITY purchasingsourceitem
   ALL FIELDS WITH lt_selection
    RESULT DATA(lt_sourcelist)
    FAILED DATA(ls_failed)
    REPORTED DATA(ls_reported).

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lt_update = CORRESPONDING #( lt_sourcelist ).
ASSIGN lt_update[ 1 ] TO FIELD-SYMBOL(<ls_adapt>).
<ls_adapt>-%data-SupplierIsFixed = abap_true.
<ls_adapt>-%control-SupplierIsFixed = if_abap_behv=>mk-on.

MODIFY ENTITIES OF r_purchasingsourcelisttp 
 ENTITY purchasingsourceitem
  UPDATE FROM lt_update
   FAILED ls_failed
   MAPPED DATA(ls_mapped)
   REPORTED ls_reported.

IF ls_failed-purchasingsourceitem IS INITIAL.
 COMMIT ENTITIES.
 IF sy-subrc = 0.
  out->write( 'Updated' ).
 ELSE.
  out->write( 'Failed Commmit' ).
 ENDIF.
 ELSE.
  out->write( 'Failed Modify' ).
 ENDIF.