[FIX] account_edi: Prevent unlinking a EDI document sent to the government

X-original-commit: ea95f62af4faa23880e7c1f1cbe1aad3b2a490da

addons/account_edi/models/__init__.py

@@ -7,3 +7,4 @@ from . import account_edi_document
 from . import account_payment
 from . import ir_actions_report
 from . import mail_template
+from . import ir_attachment

addons/account_edi/models/ir_attachment.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+from odoo import models, fields, _
+from odoo.exceptions import UserError
+
+
+class IrAttachment(models.Model):
+    _inherit = 'ir.attachment'
+
+    def unlink(self):
+        # OVERRIDE
+        linked_edi_documents = self.env['account.edi.document'].search([('attachment_id', 'in', self.ids)])
+        linked_edi_formats_ws = linked_edi_documents.edi_format_id.filtered(lambda edi_format: edi_format._needs_web_services())
+        if linked_edi_formats_ws:
+            raise UserError(_("You can't unlink an attachment being an EDI document sent to the government."))
+        return super().unlink()