Link 2 Savings of different tables

[Fa1con74]

Hello,

I have 2 "buildings" and "ebras" tables, I wish to link the recording of the table "building" to that of the table "ebras" knowing that the form of the table "ebras" s "opens at the end of the Form of the table "Building" by a behavior below.
In the "id" field of my "ebras" table in Initial Value I put this formula "buildings [file reference]" but it does not work
But the problem is that in my

[Joseph_Seddik · Accepted solution]

Your expression will return a list, that is all "file reference" values from all rows, not a single value. 

But in any case, you don't have to create an action for this task. Just use reference to link the two tables. I recommend you read this; it should much help you: 

References Between Tables | AppSheet Help Center