Tally Erp 9 Entry of IGST

HI 

Can someone help me with  to sort the below queries

I have created IGST account in Tally when and entered purchase entry with 28 % IGST  but when i to check report on total gst on Statatury report only this transcation shows as error 

ERROR   :- NAME OF DUTY LEDGER       NOT SHOWING   and on the side coloumn  LIST OF DUTY SHOW NOT APPLICABLE

Pls help Urgently

regards

sayad