Dynamically making read only for a field in get_data(CL_EHHSS_INC_BINFA_UI_FRM)

Hi Experts,
I am making read only for a field based on condition in get_data method of class CL_EHHSS_INC_BINFA_UI_FRM.
But it is not working. Pls find the code for the same.
LOOP AT CT_FIELD_USAGE INTO lw_field WHERE NAME = 'OC_INC_TYPE'.
   lw_field-read_only = ABAP_TRUE.
   MODIFY ct_field_usage FROM lw_field TRANSPORTING read_only.
   ev_field_usage_changed = 'X'.
ENDLOOP.
Pls help me what is wrong in this coding.
Regards,
Reny Richard

Hi Richard,
Please check if   this loop is executing for the correct desired event(say on click or from the start ). & the field name specified is correct or not through debugging. And check by placing the parameter ev_field_usage_changed = 'X'. after the loop statement.
Below is a sample code for making the field read only.
field-SYMBOLS: <fs_field> like line of CT_FIELD_USAGE.
   loop at CT_FIELD_USAGE ASSIGNING <FS_FIELD>.
     case <FS_FIELD>-NAME.
     when 'OC_INC_TYPE'. " name of the field
         <FS_FIELD>-READ_ONLY = 'X'.                " ' ' for editable
     ENDCASE.
CV_FIELD_USAGE_CHANGED = abap_true.
Regards,
Harsha

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Dynamically making read only for a field in get_data(CL_EHHSS_INC_BINFA_UI_FRM)

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