add list of table reference

Hi,

Can you help me about this ?

I have a column, table reference list in integer

When i try to add one or some link in stack , there is an error : requires a scalar value,
I try append, push, but i can't find how do this ?

In my external API, i receive a Booking, connect to a rental,
I add my booking in the table, but i can't join this booking to my rental ( a rental can have multiple bookings)

Thanks ! [Capture d’écran 2021-12-28 à 13.10.42.png]