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Steps for Document Number selection:
Select "IDoc outbound" or “PROXY outbound” Interface Type field for messages processed only in SAP Backend or "PI E2E Outbound" for messages processed through SAP PI/PO.
Select Document Number field and press (F4).
In IFTT PI/PO Message Selector type in: (Message Selector is available only for SAP PI/PO. Otherwise provide IDOC number or proxy GUID in Document Number field)
IFTT Object Definition used in current test case. Confirm with enter for changes to take place.
Date range within which IFTT should search for the messages on SAP PI/PO
Message number i.e. Purchase Order number. Message Selector will help you with what value should be entered by passing the variable name and its description from object definition (optionally if Automation Object contain a searching variable)
Process it (F8)
Check the content of the found messages to select an appropriate GUID that should be used as test base from the generated list. Transfer the message using Transfer selected button.
In the Parent ID field enter the CaseID of the related triggering test case.
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