Allocating an invoice with a credit balance

[SCARLETTLADY]

A customers account balance is correctly at 0.00 however, there is an invoice which is shown as partially paid - there are two invoices one with a credit balance of £25.00 the other with an amount outstanding £80.00 (although the invoice is for £105.00).  Why cannot I allocate the credit balance and outstanding invoice to the payment so that both invoices are 'paid'?

[DannR]

When you select View/Customers/ Select your customer then select the Info tab, there you have the Invoices relates to this customer, double click on the invoice you would get the invoice information, check the Invoice number directly. 

Also, you can check the information here C:\ProgramData\NCH Software\Express Invoice, check the customer and the invoice.