Changes

$linecf = new stdClass();

$linecf = new stdClass();

$linecf->id = $line->rowid;

$linecf->id = $line->rowid;

$linecf->table_element = 'facturedet';

$linecf->table_element = 'facturedet'; // you can use $this->table_element_line here instead of 'facturedet' if you want this feature to work for every module supported by CustomFields

$customfields = customfields_fill_object($linecf);

$customfields = customfields_fill_object($linecf);