static function formRule($fields, $files, $self) { $self->_dstGID = $fields['dst_group_id']; $tmp = CRM_Core_BAO_CustomField::_moveFieldValidate($self->_srcFID, $self->_dstGID); $errors = array(); if ($tmp['newGroupID']) { $errors['dst_group_id'] = $tmp['newGroupID']; } return empty($errors) ? TRUE : $errors; }