diff --git a/production/doctype/workstation/workstation.py b/production/doctype/workstation/workstation.py
index aaa4908..45851de 100644
--- a/production/doctype/workstation/workstation.py
+++ b/production/doctype/workstation/workstation.py
@@ -25,7 +25,7 @@
   def update_bom_operation(self):
       bom_list = sql(" select DISTINCT parent from `tabBOM Operation` where workstation = '%s'" % self.doc.name)
       for bom_no in bom_list:
-        sql("update `tabBOM Operation` set hour_rate = '%s' where parent = '%s' and workstation = '%s'"%( self.doc.hour_rate, bom_no, self.doc.name))
+        sql("update `tabBOM Operation` set hour_rate = '%s' where parent = '%s' and workstation = '%s'"%( self.doc.hour_rate, bom_no[0], self.doc.name))
   
   def on_update(self):
     set(self.doc, 'overhead', flt(self.doc.hour_rate_electricity) + flt(self.doc.hour_rate_consumable) + flt(self.doc.hour_rate_rent))