How to validate record in Form?

I have a block displaying 5 rows at a time.

The block display items is like

Routing_set_name,Alloy,Planner_code,Group_name,Percent,Routing_item.

I have to do a validation for any new or existing record with respect to percent column.

No routing_set_name should exceed 100%.

eg. valid data
Routing_set_name,Alloy,Planner_code,Group_name,Percent,Routing_item.

RS1                    A1      P1          G1         100 RI1

so if any one trying to enter another RS1(routing_set_name) record form should throw an error as RS1 already has 100%.

How can i do this kind of validation in form?

Thanks in advance

Prashant Pathak Received on Wed Nov 08 2006 - 19:53:15 CET