Change field attributes GR MIM Desktop BADI_WSGM_GR_MDL_GET_ITS_AT

Hi guys

I have implemented BADI BADI_WSGM_GR_MDL_GET_ITS_AT in order to change the field attributes of the GR screen on the MIM desktop.  The BADi has method GET_ITEMS_ATTRS with the below structures and tables as parameters:

IS_TASK

IS_HEAD

IT_ITEM

CS_ITEM_VISIBLE

CT_ITEM_REQUIRED

CT_ITEM_INPUT

On inspection in debugg mode i have made changes in the table CT_ITEM_INPUT.  My requirement is to change the GR Unit and then making the field uneditable.  The field GR_ENTITY_UNIT data element is WSRS_SCREEN_FIELD_ATTR with domain FIELD_ATTR with possible values of

i have some coding to change the value to 1 display only but nothing is happening to the screen.  Is it because it is a Webdynpro?? Any assistance to be able to get my screen attributes to change to display only would be appreciated.

regards

Prince Isaac