According to this issue please improve the eDocument module to make it usable / extendible for sales invoices and sales credit memos:  https://github.com/microsoft/ALAppExtensions/issues/25785

Issues are:

• The "send document" dialog for posted invoices / credit memo should not show "e-document sending"-parameters as long as there is no code behind it. Or put some code behind it to create an e-Document when it wasn't created by posting routine for this document before.
• Make it possible to access CreateEDocument functions in the module so partners could create own functionality. Now all functions are internally and e-Documents can only be created during posting.