diff --git a/printer_tray/ir_report.py b/printer_tray/ir_report.py
index 9b36724..fb77593 100644
--- a/printer_tray/ir_report.py
+++ b/printer_tray/ir_report.py
@@ -18,7 +18,7 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 ##############################################################################
-from openerp import models, fields
+from openerp import models, fields, api
 
 
 class IrActionsReportXml(models.Model):
@@ -30,3 +30,8 @@ class IrActionsReportXml(models.Model):
         string='Paper Source',
         domain="[('printer_id', '=', printing_printer_id)]",
     )
+
+    @api.onchange('printing_printer_id')
+    def onchange_printing_printer_id(self):
+        """ Reset the tray when the printer is changed """
+        self.printer_tray_id = False
diff --git a/printer_tray/report_xml_action.py b/printer_tray/report_xml_action.py
index 0e29524..5056150 100644
--- a/printer_tray/report_xml_action.py
+++ b/printer_tray/report_xml_action.py
@@ -37,3 +37,8 @@ class ReportXMLAction(models.Model):
         res = super(ReportXMLAction, self).behaviour()
         res['tray'] = self.printer_tray_id.system_name
         return res
+
+    @api.onchange('printer_id')
+    def onchange_printer_id(self):
+        """ Reset the tray when the printer is changed """
+        self.printer_tray_id = False
diff --git a/printer_tray/users.py b/printer_tray/users.py
index 57d1276..47d7faa 100644
--- a/printer_tray/users.py
+++ b/printer_tray/users.py
@@ -18,7 +18,7 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 ##############################################################################
-from openerp import models, fields
+from openerp import models, fields, api
 
 
 class ResUsers(models.Model):
@@ -30,3 +30,8 @@ class ResUsers(models.Model):
         string='Default Printer Paper Source',
         domain="[('printer_id', '=', printing_printer_id)]",
     )
+
+    @api.onchange('printing_printer_id')
+    def onchange_printing_printer_id(self):
+        """ Reset the tray when the printer is changed """
+        self.printer_tray_id = False