Sales qty as receiving tracing factor for COPA Assessment in accounts based COPA in S/4 HANA

Dear Experts,

Please help to create COPA assessment cycle for accounts based copa in S/4 HANA with sales quantity as receiving tracing factor. I can only see the following fields:

001RCMEGI-Total Quantity

002RCQT1I-Alternative Quantity 1

003RCQT2I-Alternative Quantity 2

004RCQT3I-Alternative Quantity 3

005RCWKFI-Fixed Costs

006RCWKGI-Total Costs

Is there a way to assign sales quantity field here..?

Regards

Kasireddy