Explanation
Market data types are used to provide market information for valuing financial transactions and performing market risk analysis. Some of the market data types that can be imported into the system are discount factors, forex swap rates, and security prices. Discount factors are used to calculate present values of cash flows based on interest rates. Forex swap rates are used to calculate forward exchange rates based on spot rates and interest rate differentials. Security prices are used to value securities based on market quotations. References:
https://help.sap.com/viewer/0fa84c9d9c634132b7c4abb9ffdd8f06/2020.002/en-US/3a3a8f6f7a6e4c2b8d5b8f1e2

Explanation
Some factors to consider when using flow types in SAP Cash Management are the range of flow types and their function of distinguishing forecasted cash flows from confirmed cash flows. Flow types are codes that classify cash flows according to their source and direction. The flow types from 20 to 80 are forecasted cash flows that are derived from open items or planned transactions. They distinguish forecasted cash flows from confirmed cash flows that are derived from posted documents or bank statements and have flow types from 01 to 19. References:
https://help.sap.com/viewer/0fa84c9d9c634132b7c4abb9ffdd8f06/2020.002/en-US/3a3a8f6f7a6e4c2b8d5b8f1e2