Ar Invoice Totals don't add up

Hello,

I have an AR Invoice layout which when viewed, the totals in the bottom right hand corner don't total up. To the lines on the invoice. Whilst the correct entries appear to have been made on the system and the only observation we have made is that item 1 is VAT code E2 the other 2 items are E5

I can not see anything obvious in the invoice layout template. It's: SAP Business One 2007 A(8.00.232) SP: 00 PL: 08

Presently, nett value field on the layout - is defined as being 'Free Text' Source Value. With the 'General' information looking as follows:

Unique ID: F_200

Field Type: Text

Link To: F_206

Any advice or assistance would be greatly appreciated.

Regards,

Juan