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How to access child dw in expresson of composite datawindow?

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Suppose I have composite datawindow d_mydw with embedded datawindow, say it is dw_1.

dw_1 has an item say it myname.

 

With power script, I can power script to get the value like:

 

dw_1.GetItemString(dw_1.getrow(), "myname").

 

But I want write an expression in d_mydw for a text of st to access that value.

I try above code in expression window and verify it and get error: User function was not found.

 

How to access child report dw in expression?


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