(8)Pursuant to the primary rules, CCPs must adopt internal rules and procedures containing all the relevant aspects related to its function, including the safeguards to manage credit, liquidity and operational risk. Those internal rules and procedures need to be approved by the SHCP, on the basis of the opinion of the Bank of Mexico and the CNBV. Moreover, those internal rules and procedures cannot be amended if the SHCP, CNBV or the Bank of Mexico, objects to it. The internal rules and procedures of CCPs or their modifications can also be approved subject to certain amendments. The same procedure applies to the approval and modification of the corporate documentation. Moreover, the methodologies for the calculation of the financial resources and the CCP's liquidity plan are subject to the approval of the Bank of Mexico and of an opinion of the CNBV.