Mandatory Customer Data in Sales for xRechnung and ZUGFeRD

[miljance]

Summary

• Pre-posting validation: Run Peppol validation before posting a sales document to ensure all required data is present (customer and Company Information), guaranteeing the exported E-Document is valid.
• Customer email requirement: For xRechnung, the customer’s email is mandatory and included in the XML. For ZUGFeRD, email is not mandatory in the schema, but operationally required to deliver the document to the customer.
• ZUGFeRD due date export: Export “Due Date” when no “Payment Terms” are defined for the customer, ensuring a valid ZUGFeRD format.
• ZUGFeRD XML tag corrections: Correct the XML mapping so IBAN is exported under PayeePartyCreditorFinancialAccount and SWIFT Code under PayeeSpecifiedCreditorFinancialInstitution, instead of both under PayeePartyCreditorFinancialAccount.

Work Item(s)

Fixes #29264

Fixes AB#609594