diff --git a/odoo/addons/base/res/res_config.py b/odoo/addons/base/res/res_config.py
index 8e176fe1a6f..f1bb5ffff74 100644
--- a/odoo/addons/base/res/res_config.py
+++ b/odoo/addons/base/res/res_config.py
@@ -521,7 +521,14 @@ class ResConfigSettings(models.TransientModel, ResConfigModuleInstallationMixin)
         # default values fields
         IrValues = self.env['ir.values'].sudo()
         for name, model, field in classified['default']:
-            IrValues.set_default(model, field, self[name])
+            if isinstance(self[name], models.BaseModel):
+                if self._fields[name].type == 'many2one':
+                    value = self[name].id
+                else:
+                    value = self[name].ids
+            else:
+                value = self[name]
+            IrValues.set_default(model, field, value)
 
         # group fields: modify group / implied groups
         for name, groups, implied_group in classified['group']: