Web Dynpro ALV disable column sort for specific column

Hi,
I have the above mentioned problem. The Coding I use is:
DATA: lr_field_settings TYPE REF TO if_salv_wd_field_settings,
lt_fields TYPE SALV_WD_T_FIELD_REF.
FIELD-SYMBOLS: <fs_field> LIKE LINE OF lt_fields.
lr_field_settings ?= lr_config.
lt_fields = lr_field_settings->get_fields( ).
READ TABLE lt_fields ASSIGNING <fs_field> WITH KEY fieldname = 'ANSPRECH_DETAILS'.
IF sy-subrc EQ 0.
<fs_field>-r_field->if_salv_wd_sort~set_sort_allowed( abap_false ).
<fs_field>-r_field->if_salv_wd_sort~set_grouping_allowed( abap_false ).
ENDIF.
When debugging I can see that the object attributes for sort_allowed and grouping_allowed are changed from 'X' to ' '
but the running application still allows sorting and grouping for the column 'ANSPRECH_DETAILS'.
So what did I forget or what is my mistake ????
Thx for your help.
Dino Dini

I got the similar requirement and I tried to do the below way.. it worked for me..
DATA: lr_field_settings TYPE REF TO if_salv_wd_field_settings.
DATA: lr_field TYPE REF TO cl_salv_wd_field.
lr_field_settings ?= lr_table.
lr_field = lr_field_settings->get_field( 'MATNR' ).
lr_field->IF_SALV_WD_SORT~SET_SORT_ALLOWED( abap_false
you can observe in the below image that sort option is not enabled for MATNR in the ALV.

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Hi,
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