diff --git a/addons/mrp_operations/mrp_operations.py b/addons/mrp_operations/mrp_operations.py
index 8a6efa625bb..46e1dec1e12 100644
--- a/addons/mrp_operations/mrp_operations.py
+++ b/addons/mrp_operations/mrp_operations.py
@@ -187,7 +187,17 @@ class mrp_production(osv.osv):
         for workcenter_line in obj.workcenter_lines:
             tmp=self.pool.get('mrp.production.workcenter.line').action_done(cr,uid,[workcenter_line.id])
         return super(mrp_production,self).action_production_end(cr,uid,ids)
-
+    
+    def action_in_production(self, cr, uid, ids):
+        """ Changes state to In Production and writes starting date.
+        @return: True 
+        """        
+        obj = self.browse(cr, uid, ids)[0]
+        workcenter_line_obj = self.pool.get('mrp.production.workcenter.line')
+        for workcenter_line in obj.workcenter_lines:
+            workcenter_line_obj.action_start_working(cr, uid, [workcenter_line.id])
+        return super(mrp_production,self).action_in_production(cr, uid, ids)
+    
     def action_cancel(self, cr, uid, ids):
         obj=self.browse(cr,uid,ids)[0]
         for workcenter_line in obj.workcenter_lines: