Problem with related invoice transaction

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Problem with related invoice transaction

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Dear Mr. Stemmermann,

I hope you are doing well. I have trying to get the related sales invoice from my packing list but it not showing any invoice to me. I tried to create another sales order and manually add sales packing list but still the problem remains. Can you please advise me the best course of action? Thank you so much.

I am attaching the screenshot.

 

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