Filter for edited strings

Hi,

My team and I have been trying to find a solution for the following scenario, without success. Maybe you could help:

We'd like to create a filter to identify strings that were changed by the proofreader and immediately validated, so they cannot be distinguished from the ones that were validated without any edition. The available out of the box filters allow us to find strings that were "changed", but this includes any status change and returns much more strings than the ones we one catch.

So, is there a customized filter formula to find strings that were edited in a certain period of time, but excludes any status changes?

We use Passolo 2016.

Thanks in advance!