the id was `acl` which seems to be a copy paste-mistake
public function populate() {
parent::populate();
- $this->getDocument()->getDataHandler()->addProcessor(new CustomFormDataProcessor('acl', function(IFormDocument $document, array $parameters) {
+ $this->getDocument()->getDataHandler()->addProcessor(new CustomFormDataProcessor('tags', function(IFormDocument $document, array $parameters) {
if ($this->checkDependencies() && $this->getValue() !== null && !empty($this->getValue())) {
$parameters[$this->getObjectProperty()] = $this->getValue();
}