Explanation/Reference:
You can define procurement document numbering using the Manage Procurement Document Numbering page.
Note: Organizations need the ability to define procurement document numbers based on document type.
The sequence may differ by legal entity or business unit. Here are some considerations when defining a document numbering sequence.
If a document number sequence is not defined in advance, the application creates it when the first transaction is created for that document type and legal entity or business unit combination. The application starts the document number with 1.
References: https://docs.oracle.com/cloud/latest/procurementcs_gs/OAPRO/ OAPRO1061042.htm#OAPRO1405307