Event Rules - Auto populate and Object

Hello,

I would like to make the "Sample Number" ( SNBR) in the P3711 Enter Test Results come up automatically, based on the previous grid line entry of that field.

Currently we use that field for the WO# associated to the enter test result application.

I checked, and that field isn't carried over from the FI (Work with Enter Test Results).

So how could I get this to populate automatically when revising an existing Test Result, so we don't have to keep adding it in for every line?

Regards

David