error behavior copy row

hi, i’ve created a simple behavior for copy some column in a row of another table.

the behavior is correct but when i use it the valor of column is ,(valor of column copied),

why are there the varios , ?

the valor of column is a reefer of another table anagrafica pv[pv]

thanks a lot

You need to elaborate. I suggest using screenshots as your English is apparently not great.

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yes I apologize for my english, i use google translate at least i hope it is more readable.
I created a behavior to copy the value of a column into a row of another table.
only when applied, the value of a field appears with a series of , before and after

It looks like the value is a List of values, where there are a large amount of empty/blank values. What is the expression used?

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