Thank you for your answer Julius Kavay.


I'm using your solution.
But unfortunately, I'm facing another problem. The indexes are not working.

Index numDossiersMERIdx On numDossiersMER(ELEMENTS);

Index numDossiersMERKeyOn numDossiersMER(KEYS);

I added both lines to my class, but it's not used by IS.
How can I put an index on numDossiersMER elements and use it ?

Thank you