values for Net Value Incl .taxes showing wrong in ML81N

Hi,

While creating the service entry sheet using tcode ml81n, values for Net Value Incl .taxes(Non deductible tax) not calculate for First Item.but when i removed the Tax code from line item , tax get calcualte.

Po Screen Shot for First Line Item

Screen Shot Service Entry Sheet for first Item

When I removed the tax code , tax would be calculated in Net Value Incl. Tax but GRN amount showing wrong.

PO screen Shot for 2nd Item.

Screen Shot for Service Entry Sheet 2nd Item

Thanks & Regard's

Sachin Indulkar