The Manufacturing organization I am working with is migrating to ERPNext.
From what I see, ERPNext has a different way to manage naming series.
In their business process, there are no grouped purchase orders coming from material requests and other documents are based on the sales order number.
Sales Order → PI19-193
Purchase order 1 → PO19-193A
Purchase order 2 → PO19-193B
Purchase order n → PO19-193Z
There is a way to setup ERPNext working in this way without customizing source code?