diff --git a/addons/project_timesheet/project_timesheet.py b/addons/project_timesheet/project_timesheet.py
index 1783d871334..0a9cb910b45 100644
--- a/addons/project_timesheet/project_timesheet.py
+++ b/addons/project_timesheet/project_timesheet.py
@@ -29,23 +29,21 @@ from tools.translate import _
 class project_project(osv.osv):
     _inherit = 'project.project'
 
-    def _amt_to_invoiced(self, cr, uid, ids,field_name, arg, context=None):
+    def _amt_to_invoice(self, cr, uid, ids,field_name, arg, context=None):
         res = {}
-        task_pool=self.pool.get('project.task')
-        for id in ids:
-            task_ids = task_pool.search(cr, uid, [('project_id', '=', id)])
-            total = 0.0
-            project_record = self.browse(cr,uid,id)
-            acc_model = self.pool.get("account.analytic.line")
-            acc_id = acc_model.search(cr, uid, [('account_id', '=', project_record.analytic_account_id.id),('to_invoice', '=', 1),('invoice_id', '=', False)])
-            if acc_id:
-                for record in acc_model.browse(cr,uid,acc_id):
-                    total += record.amount
-            res[id]= total
+        aal_pool = self.pool.get("account.analytic.line")
+        for project in self.browse(cr,uid,ids,context=context):
+            line_ids = aal_pool.search(cr, uid, [('account_id','=',project.analytic_account_id.id),('to_invoice','=',1),('invoice_id','=',False)])
+            amt_to_invoice = 0.0
+            if line_ids:
+                for line in aal_pool.browse(cr,uid,line_ids,context=context):
+                    amt_to_invoice += line.amount
+            res[project.id] = (amt_to_invoice)*-1
         return res
+
     _columns = {
         'timesheets' : fields.boolean('Timesheets',help = "If you check this field timesheets appears in kanban view"),
-        'to_amt_invoice': fields.function(_amt_to_invoiced,string="Open Tasks")
+        'amt_to_invoice': fields.function(_amt_to_invoice,string="Amount to Invoice")
     }
     _defaults = {
         'timesheets' : True,
diff --git a/addons/project_timesheet/project_timesheet_view.xml b/addons/project_timesheet/project_timesheet_view.xml
index 3be2a8437ac..a20400c6f2e 100644
--- a/addons/project_timesheet/project_timesheet_view.xml
+++ b/addons/project_timesheet/project_timesheet_view.xml
@@ -9,7 +9,7 @@
             <field name="arch" type="xml">
             	<xpath expr="//field[@name='task']" position='after'>
 		    		<field name="timesheets"/>
-		    		<field name="to_amt_invoice" invisible="True"/>
+		    		<field name="amt_to_invoice" invisible="True"/>
                 </xpath>
             
                 <field name="warn_customer" position="after">
@@ -34,7 +34,7 @@
                     <field name="timesheets"/>
                     <field name="total_hours"/>
                     <field name="effective_hours"/>
-                    <field name="to_amt_invoice"/>
+                    <field name="amt_to_invoice"/>
                 </field>
 		<xpath expr="//t[@t-name='tasks']" position="after">
                     <t t-name="timesheets">
@@ -54,13 +54,12 @@
                     <t t-if="record.timesheets.raw_value">
                         <button name="open_timesheets" class="oe_project_buttons" type="object" tooltip="timesheets"><img src="/project_timesheet/static/src/img/timesheet_icon.png" class="project_icon"/></button>
                     </t>
-                    <t t-esc = "to_amt_invoice"/>
                 </xpath>
 		<xpath expr="//td[@class='td_name']" position="after">
 		    <td class="td_deadline">
 			<div class="sequence">
 			    <kbd class="user">To invoice</kbd>
-			    <div class="manager"><b><field name="to_amt_invoice"/> <field name="currency_id"/></b></div>
+			    <div class="manager"><b><field name="amt_to_invoice"/> <field name="currency_id"/></b></div>
 			</div>
 			<div class="sequence">
 			    <kbd class="user">Rem. Hours</kbd>