avoid automatic printing of invoices

datev_export_xml_nitrokey/README.rst

@@ -4,3 +4,4 @@ DATEV Export XML Nitrokey customization
 - DATEV export will contain sales order number instead of invoice number
 - check for some UTF8 ranges before export
 - suppress lines with a total of 0 entirely
+- avoid automatic printing of invoices on paper (via CUPS)

datev_export_xml_nitrokey/models/__init__.py

@@ -2,4 +2,5 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
 from . import account_move
+from . import datev_pdf_generator
 from . import datev_xml_generator

datev_export_xml_nitrokey/models/datev_pdf_generator.py

@@ -0,0 +1,14 @@
+# © 2023 initOS GmbH
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, models
+
+
+class DatevPdfGenerator(models.AbstractModel):
+    _inherit = "datev.pdf.generator"
+
+    @api.model
+    def generate_pdf(self, invoice):
+        return super(
+            DatevPdfGenerator, self.with_context(must_skip_send_to_printer=True)
+        ).generate_pdf(invoice)