You are working with security transactions.

The position is the basis for valuation flows when working with security transactions. The position is the quantity of securities that are held in a portfolio at a given point in time. The valuation flows are the cash flows that are generated by valuing the position based on market data and valuation rules.References:https://help.sap.com/viewer/0fa84c9d9c634132b7c4abb9ffdd8f06/2020.002/en-US/3a3a8f6f7a6e4c2b8d5b8f1e2a2a0d5b.html