>>>Pls note that these are multiple Items for a single order/invoice, that is why i've kept data entry in grid..
>>
>>Great - you can only be working on one line at any given instant.
>
>Pls advs. if there is any problem using grid, because i'm not able to understand, what exactly you mean..

It's a different philosophy on what should be done in a Grid - using a separate frame for data entry done on the currently selected record in the Grid, that doesn't have the context shifting issues of a grid, works better for me. YMMV. Good luck with your problem.