Returns capture and Key figure settings

Hello Experts,

I have a scenario like this for my history capture process.

I have sales order history of 10 for the month of September.

Now I have the returns of the same month for the same product 12.

How will this be captured in DP? Will it be captured as -12 or 12?

I expect the aggregated demand to be 0 and not -2.

Is there a possibility to do this in the key figure settings or should i code this in Update rules.

Thanks,

Suresh