In the event of replacement, the Commission shall ensure that the new variables can be derived from the data sources specified in Article 4(2).
I gcás ina ndéanfar an cur in ionad sin, áiritheoidh an Coimisiún go ndéanfar na hathróga nua a dhíorthú ó na foinsí sonraí a shonraítear in Airteagal 4(2).