Double action button

Hello everyone,

I've created a data base witch manage software licence subcriptions.

I've added one button that allows to renew the licence.
I want that button to add one year to the end date contract and re-initialize the commercial follow-up.

I've wrote the "on-click" code below to do that :
('Fin de contrat' := 'Date Renouvellement') and ('Statut Bouton' := null)

But when i click the button, only the first action is done but not the second one.
Even if i invert the two i've got the same problem.

Am i doing wrong ?

Thanks for help.

Lionel.