Active (Unlocked)  invoice - an open invoice that can be modified.

Inactive (Locked) - invoice is loced - no changes can be made to the items included in the invoice.

Each contact in the database can have many invoices recorded against their record but only one transaction per contactcan be active at any given time. This is called the ACTIVE transaction for that contact. Adding items, using the Include command, to the transaction for the current contact automatically adds to this transaction. If no active transaction exists for the current contact one is automatically generated when the first item is added using the INCLUDE (Alt U) button on the Stock or Catalogues forms. If you wish to modify an invoice or receipt that is currently INACTIVE (shipped date set) you must first call up the transaction and REACTIVATE it using the REACTIVATE button on the Transactions form. When modifications are finished you should DEACTIVATE it using the DEACTIVATE button or, if you intend to send the modified invoice to the contact reprint it and answer YES when prompted to confirm if it has output correctly.