Invoices with VAT summary lines cannot be marked as paid in companies on the VAT Cash Accounting (UK) VAT scheme.
For companies on the cash based schemes mentioned above, payment transactions for invoices marked as paid are now posted with the same tax code as the invoice (for the other schemes payments are posted with a value of T9). There are now also added restrictions for invoices for companies integrated with Sage 50 UK&I and using these VAT schemes.
Invoices which have line items/tax summary items AND mark as paid enabled for that invoice will have an error set when they are attempted to be inserted into Sage 50.
You can clear this error by doing the following: