If: Object reference not set to an instance of an object.(reframework)

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From the description, based on the naming convention, the values should be like:

  1. in_TransactionNumber = IN (argument)
  2. io_TransactionData = IN/Out (argument)
  3. out_transactionItem = Out (argument)

So, if you ask meat least all these three arguments should be in that Invoke Workflow arguments.

You must recheck how you configured the arguments in your workflow. The direction is not good, so that’s the reason why the error appear.

Vasile.