I just leave this here, it may help someone (as well as new colleagues ) with data imports using csv files :
Use demo files from the Axelor github repository :
ex : axelor-account/src/main/resources/apps/demo-data/fr/account_account.csv
You can see that values are separated with the semicolon " ; " separator :
To get the demo files :
(https://rpubs.com/lokraj/github_csv)
To import the file in Axelor, it must be saved ONLY with the semicolon separator activated :
This way you can avoid error such as : « javax.validation.ConstraintViolationException: Validation failed for classes »
Path In Axelor : Application Config > Technical Maintenance > Imports :
XML Binding File from Axelor github repository :
CSV data source from Axelor github repository:
axelor-account/src/main/resources/apps/demo-data/fr/account_account.csv
and IMPORT !