Lookup Drivers in LIM is not working

Hi All,

I'm working with Line Item Modelling to implement workforce solution and trying Lookup drivers for one of the calculations. Lookup drivers doesn't seem to work at all. Has anyone tried and whether its working? The lookup driver that i defined doesn't fetch & return anything while using in calculation (formula) though it returns data while i preview it under Lookup drivers. Any help on this would be much appreciated. Thanks in advance.

Cheers - Ramesh.