Your customer tells you that the agreement document sequencing should be 10-digit numbers starting with 999 (for example 9990000001, 9990000002, and so on) and the negotiation document sequencing should also be 10-digit numbers but should start with 777 (for example 7770000001, 7770000002, and so on).
Identify the functional task where you will set up the required document numbering.