/**
* Mark a field as modified
* @param string $strKey The field key
*/
public function markModified($strKey)
{
if ($strKey == 'locked') {
throw new \InvalidArgumentException('Cannot change lock status of collection');
}
if ($strKey == 'document_number') {
throw new \InvalidArgumentException('Cannot change document number of a collection, must be generated using generateDocumentNumber()');
}
$this->arrItems = null;
$this->arrSurcharges = null;
$this->arrCache = array();
parent::markModified($strKey);
}
