KEU2 Sender Values - Variable portion

Hi Experts,

We have impemented COPA. Account based COPA.

I am creating assessment cycle in KEU2. I found many option under Receiving tracing Factor and selected the below option -

Rule - Variable Portion

Amount Field - 1

Scale Neg. Factors - Standard Scaling

Under Receiver tracing factor, there is one field Reference Ver. What does this field means? Where is the configuration of this field? Is it applicable for account based copa?

Please guide.

Regards

Zunaid