Solution : https://service.sap.com/sap/support/notes/1109487 (SAP Service marketplace login required)
Key words :
short description 'document type paymentflow''ecc', short description 'encrypted character string'save, short description 'approval year''apn', short description 'approval number''snc', short description 'serial number, short description 'payment method, mexican sales organization andyou, terms invoice02idocqualifierxmldigital invoiceidmx_di reason, basic type invoic02, creating billing documents
Related Notes :
1303712 | Mexico: Enable Creation of Digital Signature in SD and FI |
1280467 | FAQ Digital Invoice Mexico |