Against many answers in this forum the "Description" field doesn't map to the Sender-Reference of the generated SEPA Credit Transfer.
I guess it's mapped into the Info field.
In P2P that won't make any difference, but especially P2B and P2G there's a legal requirement to provide the correct reference in the correct field, to allow their systems to book the payment to the according account - otherwise it's handled like the payment didn't arrive at all, with all pretty serious negative consequences (late interest, penalty, cancellation of contracts, ...)
In addition to that, I'm astonished how many users did mislead others, which asked especially about the reference field.
The EPC shows the possible fields in detail: https://www.europeanpaymentscouncil.eu/sites/default/files/KB/files/EPC069-12%20v2.1%20Quick%20Response%20Code%20-%20Guidelines%20to%20Enable%20the%20Data%20Capture%20for%20the%20Initiation%20of%20a%20SCT.pdf
2nd and 3rd to last are mutually exclusive, but equally important and users must be able to select which one they'd like to fill and especially able to fill them with the reference numbers they've been given by authorities.