models/classes/ExtendedStateService.php
public function removeCatValue($testSessionId, $assessmentSectionId, $key)
    {
        $extendedState = $this->getExtendedState($testSessionId);
        $extendedState->removeCatValue($assessmentSectionId, $key);
        $extendedState->save();
    }
public function removeCatValue($testSessionId, $assessmentSectionId, $key)
    {
        $extendedState = $this->getExtendedState($testSessionId);
        $extendedState->removeCatValue($assessmentSectionId, $key);
        $extendedState->save();
    }
Remove a CAT value from the ExtendedState.

@param string $testSessionId
@param string $assessmentSectionId
@param string $key
@throws \common_Exception