Select Option:Update LOW & HIGH fields on F4

Dear Experts,

I am trying to update Select-Options Ranges when F4 is Chosen.On choosing F4 i display a popup with options to select range of accounts using FM:F4IF_INT_TABLE_VALUE_REQUEST. I tried to update(DYNP_VALUES_UPDATE) but its not working.

Can you please guide me how to update the Select option ranges?

Your help is highly appreciated.

Thanks.

Prabaharan