Related records not showing up as linked to parent table - Appsheet <> Airtable

[giacomo_]

Problem

Related records to a table don't show up as "linked" to its parent table. The creation of the records and the "linking" to the parent record in Airtable both work well. 

Nonetheless, even if they are all correctly linked in Airtable, the relation doesn't show up in AppSheet.

Context & structure

I have 4 tables:

Incoming: where the incoming item is registered when it's received. Refs to Manufacturers and Unit are in place to select  the respective linked records in the tables (in Airtable).

Components: Table that "is part of" Incoming. Basically, they are the components of which an item in Incoming is made of. 

 

 

 

 

It is connected to the Incoming via the "Incoming Link" column. These are the settings for the field/column

 

 

 

 

 

As mentioned above, when creating an "Incoming record" and its components with the Incoming_From, everything works well. All the rows are created in Airtable, respectively the main record in the "Incoming" table and the related components in the "Components" table. All the records are correctly linked together:

 

Nonetheless, even if AppSheet manages to create and link everything, the relationship doesn't show up in AppSheet.The Related Components are always 0:

These are the relevant column settings in the "Incoming" table:

Any idea about why AppSheet doesn't see them as linked? Is there anything I'm missing?

Thanks!