Invoice/EventListener/AbstractInvoiceListener.php
protected function preventForbiddenChange(InvoiceInterface $invoice)
    {
        if ($this->persistenceHelper->isChanged($invoice, 'type')) {
            list($old, $new) = $this->persistenceHelper->getChangeSet($invoice, 'type');
            if ($old != $new) {
                throw new Exception\IllegalOperationException(
                    "Changing the invoice type is not yet supported."
                );
            }
        }
    }
protected function preventForbiddenChange(InvoiceInterface $invoice)
    {
        if ($this->persistenceHelper->isChanged($invoice, 'type')) {
            list($old, $new) = $this->persistenceHelper->getChangeSet($invoice, 'type');
            if ($old != $new) {
                throw new Exception\IllegalOperationException(
                    "Changing the invoice type is not yet supported."
                );
            }
        }
    }
protected function preventForbiddenChange ( InvoiceInterface $ invoice ) { if ( $ this -> persistenceHelper -> isChanged ( $ invoice , 'type' ) ) { list ( $ old , $ new ) = $ this -> persistenceHelper -> getChangeSet ( $ invoice , 'type' ) ; if ( $ old != $ new ) { throw new Exception \ IllegalOperationException ( "Changing the invoice type is not yet supported." ) ; } } }
Prevents some of the invoice's fields to change.

@param InvoiceInterface $invoice

@throws Exception\IllegalOperationException
Prevents some of the invoice s fields to change .