Adding Value Attribute for checkbox in BTPARTNERSET(Model Node)

Hi Gurus,

I need to Add a Checkbox in general data tab for problem case (Component SRQM_PROBLEM_H). However whenever I am trying to create a value attribute and assigning its Get_P_XXX method as field_type_checkbox. It goes fine but as soon as i open the UI screen with agent role it gives me dump( Attached screenshot)

I tried creating a model attribute of DDIC structure checkbox like ERROR_FLAG/DELETED_FLAG/ARCHIVING_FLAG. Then Checkbox gets created however it always come as checked. even if i uncheck and save it becomes checked.

I tried passing initial value space but than it always turned out to be uncheck. If i check and save then on save it turns uncheck again.

Kindly help.

Regards,
Nuvan