Translate the following English sentence to French:
"These rules are necessary if we are to be able to harmoniously apply the principle of mutual recognition of legal judgments, which will, of course, involve a debate on determining the principles and rules that apply to the competence of the Member States' courts when they rule on trans-border disputes."
Cela passe naturellement par un débat sur la détermination des principes et des règles applicables à la compétence des tribunaux des États membres dans le cas de litiges transfrontaliers.