Translate the following English sentence to French:
"But there are other issues which go beyond the Convention' s remit, and which are above all a matter for the Heads of State and Government meeting within the European Council, as well as for the Intergovernmental Conference itself."
Mais il y a d' autres questions qui dépassent le cadre de travail de la convention et qui s' adressent surtout aux chefs d' État et de gouvernement formant le Conseil européen, en tant que destinataires de la conférence intergouvernementale.