Purchase Order Number Generation using API

Summary:

Content (please ensure you mask any confidential information):

We are planning to create PO using this API -https://docs.oracle.com/en/cloud/saas/procurement/26a/fapra/op-draftpurchaseorders-post.html

Auto generation of PO numbers are already implemented . However requirement is to generate some custom PO number using this API, passed as a part of the payload - OrderNumber field. If we pass the Custom Alpha Numberic value in OrderNumber field, system ignore the auto generation and create PO Number as it is passed from the API?

Is there any consequences for the same like Auto Numbering will be skipping. Please provide any documental link if you have any.