How to use object walker with dynamic foreign keys

Hi, I would like to find AccProduct.ProductCode in the process PreScript attached to the PWO table.

I have tried to use walker

...
"$FK(ObjectKeyOrdered).FK(UID_AccProduct).ProductCode$"
...

unfortunately I'm getting an error:

"Name of the destination table has to be provided for dynamic foreign keys."

How wlaker should be formatted?

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