Filter row condition between columns of two tables do not work (begginer)

[baba_sawane]

Hi everyone. 

I'm currently facing an issue with my first app, and after hours of trying to resolve it, I did not find why my filter do not work. 

I have two tables and I want to slice the first table based on the value of the 2nd column. 

First table is QUAL FORM 01[Code chantier :] (it's actually longer but it's for your understanding

Second table is Selection[Code chantier :]

Both are Text type. The formula i'm using is : 

QUAL FORM 01[CODE CHANTIER (voir sur le plan de contrôle) :] = Selection[Code chantier :]

I'm a begginer in AppSheet, can you please guide me to find a solution ?