Tax amount calculate in Vat Settlement, if vat not calculate in sales invoice & cust. exempt in VAT

Hi everybody,

I am using NAV2013R2 Indian localization, i create a sales order which customer exempted in VAT.
in customer card VAT Exempted = Yes
in Sales Order VAT Exempted = Yes
when we post sales order then
VAT not calculate in Invoice and no g/l entry made related to VAT. it's ok
but in 'Detailed tax entry' tax amount line generated with Tax and show in vat settlement in output tax regarding this invoice

thanks