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Message Mapping - assign value of duplicate items

Dear All,

Need your advice to sort out below.

below is the structure I have defined in Message Mapping.


If Order Item - J_3APOSNR is "Blank" then item_key = "some value".

I defined my mapping as below

this is working fine as long as I pass "J_3APOSNR" value blank ..

But If I set some values to "J_3APOSNR" and repeat "order item" header node more than one , showing an error that item_key cannot be created.

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