(7)In order to ensure that a CCP does not apply discriminatory collateral and margining requirements to economically equivalent contracts traded on a trading venue that has been granted access to the CCP, any change to the margining methodology and operational requirements regarding margining and netting applied to economically equivalent contracts already cleared by the CCP should be subject to a review by the risk committee of the CCP and be considered as a significant change to the models and parameters for the purpose of the review procedure provided in Regulation (EU) No 648/2012. Such a review should validate that the new models and parameters are non-discriminatory and based on relevant risk considerations.