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diff --git a/lims_management/models/stock_lot.py b/lims_management/models/stock_lot.py
index 5cd2659..f18c1d1 100644
--- a/lims_management/models/stock_lot.py
+++ b/lims_management/models/stock_lot.py
@@ -490,10 +490,14 @@ class StockLot(models.Model):
         if receptionist_group:
             receptionist_users = receptionist_group.users
             
+            # Get the model id for stock.lot
+            model_id = self.env['ir.model'].search([('model', '=', 'stock.lot')], limit=1).id
+            
             # Create activities for receptionists
             for user in receptionist_users:
                 self.env['mail.activity'].create({
                     'res_model': 'stock.lot',
+                    'res_model_id': model_id,  # Campo obligatorio
                     'res_id': resample.id,
                     'activity_type_id': self.env.ref('mail.mail_activity_data_todo').id,
                     'summary': _('Nueva re-muestra pendiente de recolección'),