private boolean isInAssociation(String itemName)
    {
        LectureItem lecture = workingManager.getKeyWith(itemName);
        LabItem lab = workingManager.getValueWith(itemName);
        if(lecture == null && lab == null)
        {
            return false;
        }
        else if(workingManager.eraseKey(lecture))
            {
                return true;
            }
        else if(workingManager.eraseValue(lab))
            {
                return true;
            }
            else
            {
                return false;
        }  
    }