How to use action "Tables: Update a Row " ?

Hello, dear team:
I tried to use the action Tables: Update a Row
I just want to make a simple update for test.
I tried to input PN&Qty, {{PN}}&{{Qty}}, {{pn}}&{{qty}},
However error persists always: The "Columns" and "Look up column names" field values are incorrect handlebar references.
Could you please check my test case in the picture and tell me how can I input the fields?

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