Translate the following English sentence to French:
"There was an agreement - and all the group chairmen will confirm this - between the group chairmen that we would not address concrete cases relating to individual groups in the report, but that in future we will jointly endeavour to tackle any problems that may arise."
Il existait un accord entre les présidents de groupe - ceux-ci le confirmeront - d'après lequel nous ne traiterions pas des cas concrets dans ce rapport mais que nous nous efforcerions ensemble, là où subsistent certains problèmes, d'y remédier.