The notes to clauses 19 and 21 draw attention to the Fair Work Regulations 2009 (reg 3.33(3) and reg 3.46(1)(g)), which govern the pay records the employer must keep and the content of payslips, including listing every allowance paid as a separate item. With the many allowances in clause 21, each must be separately identified in records and on the payslip.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.