Currently only Sales documents are retrieved using PAC Webservices for Requesting Stamp for: Posted Sales Invoices, Posted Sales Shipments, Payments, and Foreign Trade. We are also able to request cancelation and recently reviewing cancelation status for documents.

But all the purchases workflow is done without almost any automation at all, specially when it comes to get special data like the folio fiscal UUID from SAT and the current status of the document in Authority's database. We should be able to retrieve incoming purchase invoices with corresponding CFDI data directly from SAT WebServices (which are public) and create the document to continue processing them in Business Central.

We should also to recieve and respond to cancelation requests from Vendors.

An e.firma certificate is required for this connection and all the technical documentation is available in the technical documents provided by authorities

All local accounting software in the market has this functionality embedded which makes it almost a requirement for companies to adopt not only Business Central as their only solutions. But also to adquire a specialized local software for accounting. This should not be the case. This functionality must be part of the core in an ERP specially in a company which is growing their transaction volume.

This is a most-have. And I think it could be implemented using the new E-Document Engine from the latest release.