Are you missing use of the ERPPipeline when configuring SendPort_SendToERP between Item 23 and 24? Since the pipeline is made during the tutorial, I assume it should be used somewhere?
Text suggestion:
Change 23. to: In the FILE Transport Properties dialog box, on the General tab, in the File name box, type %MessageID%.txt, and then click OK.
Change 24. to: In the SendPort_SendToERP – Send Port Properties dialog box, from the Send pipeline drop-down list, select ERPPipeline, and then click OK.
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