[FIX] rma: Do not set 'Destination Package' if RMA package comes from 'Customers' location

rma/models/stock_quant_package.py

@@ -0,0 +1,14 @@
+# Copyright (C) 2023 ForgeFlow S.L.
+# License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl.html)
+
+from odoo import models
+
+
+class QuantPackage(models.Model):
+    _inherit = "stock.quant.package"
+
+    def _allowed_to_move_between_transfers(self):
+        res = super(QuantPackage, self)._allowed_to_move_between_transfers()
+        return res and self.location_id != self.env.ref(
+            "stock.stock_location_customers"
+        )