I have a DDIC structure containing fields BUKRS and SAKNR. A foreign key is defined for field SAKNR on check table SKB1, using keys MANDT, BUKRS, SAKNR.

A table of that structure is displayed in an ALV grid (CL_GUI_ALV_GRID). Field SAKNR is set to editable in the field catalog. BUKRS is not.

By using the search-help on SAKNR and picking a value of SAKNR that exists only associated with a certain value of BUKRS, the value of BUKRS changes in the ALV.

I want field BUKRS to restrict the search, not change value.

How can I either:

• Prevent changes of values that are not editable
• Grey-out foreign key values in the search help dialog (BUKRS should be greyed-out as a fixed value when searching for a value of SAKNR)

I’ve tried setting all cells of other fields as “disabled” in the corresponding STYLE tab, that did not work either. I would rather not create custom search helps to solve this, as this would require tremendous work given the number of standard fields that could cause this.

Sample code:

DATA: lt_fcat type lvc_t_fcat.

CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
  EXPORTING
    i_structure_name       = 'ZTEST_SAKNR'
  CHANGING
    ct_fieldcat            = lt_fcat
  EXCEPTIONS
    inconsistent_interface = 1
    program_error          = 2
    others                 = 3
  .

lt_fcat[ fieldname = 'SAKNR' ]-edit = abap_true.

data(lo_alv) = new cl_gui_alv_grid(
  i_parent  = cl_gui_container=>default_screen
).

DATA: lt_test type table of ztest_saknr.

SELECT * FROM SKB1 INTO CORRESPONDING FIELDS OF TABLE @lt_test.

lo_alv->set_table_for_first_display(
  CHANGING
    it_outtab                     = lt_test
    it_fieldcatalog               = lt_fcat
  EXCEPTIONS
    invalid_parameter_combination = 1
    program_error                 = 2
    too_many_lines                = 3
    others                        = 4
).
IF SY-SUBRC <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*   WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.

CALL SCREEN 1000.