Good Day

I am a Pastel User V 14.0.1, our organisation use a different invoicing package and only import CVS file to pastel at end of month. I have recently discovered that even though i import my invoices inclusive of VAT when they are in pastel they are charged again eg if i import an invoice $60.00 inclusive, in patel it will be $69.00
Kindly assist on how i can change the settings in patel to match the imported invoice values.