New Document Types
Is there any guidelines/best practices in creating new document types whereas you can't use lettering that SAP has for standard document types? For example, SA is for a General Document Posting. If I needed another SA document type, say General Document Posting for Closing and call it SC, is that doable? I was always under the impression SAP wants new document types that clients need to start with Z. In this case, instead of SC, I would create ZC.
Any guidance would be helpful. I'm using my old memory of SAP best practices, but maybe it no longer is a best practice.