Set up number sequences by using a wizard

Number sequences are used to generate readable, unique identifiers for master data records and transaction records that require them. A master data or transaction record that requires an identifier is referred to as a reference. Before you can create new records for a reference, you must set up a number sequence and associate it with the reference.This procedure explains how to set up all required number sequences at the same time by using a wizard. 

https://docs.microsoft.com/en-us/dynamics365/unified-operations/fin-and-ops/organization-administration/tasks/set-up-number-sequences-wizard

1. Change Company "Your Company" 
2. Go to Organization administration > Number sequences > Number sequences.

Click Generate

Click Next

Click Next

On this page, you can modify the identification code, the lowest value, and the highest value. In addition, you can indicate whether the number sequence must be continuous.

• Do not select the Continuous option if you must preallocate numbers for the number sequence. To add a scope segment to the format of a number sequence, select the format in the list, and then click Include scope in format. To remove a scope segment from the format of a number sequence, select the format in the list, and then click Remove scope from format. To exclude a number sequence from automatic generation, select the number sequence in the list, and then click Delete.

Click Finish

Note: To assure the successfully done, check number sequence tab in the General ledger parameters.