LIST Window UIBB in Custom MDG

Hi Gurus,

This question is with respect to List Window UIBB, component FPM_LIST_UIBB_ATS using feeder class CL_USMD_ENTITY_VALUE2_PROXY. Please see the screen shots below. I configured few attribute elements display type as input field, but at run time it does not allow me to edit the elements. I am able to edit the Form Window attributes but not the List Window attributes. Can somebody help me on this?

Attribute Settings/Properties:

Runtime Results:

Thanks.

Ramesh