SAP CRM WebUI : Sorting custom columns (custom attributes)

Hi to everybody,

i have a little problem on SAP CRM WebUI.

I created a whole custom view inside factsheet page, component BP_FACTSHEET.

I have already filled inside method GET_P_* the following code :

WHEN if_bsp_wd_model_setter_getter=>fp_sortable.

rv_value = 'TRUE'.

but data is NOT being sorted by custom columns.

How can i solve this problem? Someone could you help me,please?

Thanks in advance.

Best regards.

Dario.