On both a VAT sales invoice and VAT purchase invoice, there is parameter Internal document available. If it is checked, payments are not generated to given invoices. If the parameter is checked while editing an issued invoice, the payments already generated are deleted.

The following rules have been adopted referring to possibility of checking Internal document parameter:

• Parameter is available and editable only on manually added VAT invoices and their corrections
• Parameter is greyed out on a posted document
• Parameter is greyed out on a confirmed document if full diagram of VAT invoice statuses is enabled
• Parameter is greyed out if a document includes completed or partially completed payments
• Parameter is greyed our if payments of a document have been included in an SRO
• Parameter is greyed out if payments of a document have been included in debt collection documents