I use the read data action with two related models within and need to use some fields from these models, but dont know how do it.

Tried a lot of variants, but always get the error "Unsupported operand types" or blank page.

It works only if i use the fields from the same model and fill the X and Y fields only with fields names without any characters or expressions.
How to solve this problem?

Thanks in advance for help.


Tried a lot of variants, but always get the error "Unsupported operand types" or blank page.

It works only if i use the fields from the same model and fill the X and Y fields only with fields names without any characters or expressions.
How to solve this problem?

Thanks in advance for help.
The field names should be model.field
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