https://userapps.support.sap.com/sap/support/knowledge/en/2754175
2754175 - Project Invoicing Request Source Document Showing as Supplier Invoice
You find the source document of a project invoicing request is showing as supplier invoice, but you don't understand why.
project invoicingsource documentrequestshowingsupplier
https://www.zoho.com/au/billing/kb/time-tracking/proj-based-on-milestone.html
Invoicing a Project Based on Milestones Achieved| FAQ | Zoho Billing
Learn if it's possible to invoice a project based on milestones achieved in Zoho Billing.
a projectbased onmilestones achievedinvoicingfaq