I am trying to create a relationship between the above two lists "Supplier" and "Products".
I have followed the guide here: Setting up relationships with virtual tables with Power Apps - Power Apps | Microsoft Learn
However it applies to a use case of one native and one virtual table.
I am able to get the lookup to work as intended but cant seem to figure out how the values can be saved, and keep getting: ".... response 400 ...the passed-in field could not be found..."
If I follow the example strictly it would mean the "external Name" should be the name of the column in the table that is being looked up - is that correct? In this case the SPO title field?
Would appreciate if anyone has any pointers on this.

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