How to Find ECC IDOC Number in PI

Method 1

How to Find ECC IDOC Number using PI Message?
Use TCODE IDX5 in PI and enter the message ID and you will able to see the corresponding IDOC number in PI. Click on that IDOC number and you will able to find the IDOC corresponding IDOC number from ECC.

Method 2

Find IDOC Number with T-code SXI_MONITOR IN SAP PI

In sxi_monitor go to Call Adapter -> SOAP Header -> RunTime and get the value of the <SAP:EOReferenceOutbound type="TID"> attribute. This one is called the Transaction ID or TID for short. Make sure to use the EOReference Outbound because there are two more nodes with similar name.

Then go to your ECC system and search the IDoc number in EDIDS table, typing the TID found in XI into EDIDS-TID field. You can also call the INBOUND_IDOCS_FOR_TID function module instead of searching EDIDS. Unfortunately, I'm afraid there is no standard transaction to search IDocs by TID.

Note: 

IDOC number assigned in PI is not the same as generated in SAP ERP 

There is no direct T-Code to search IDOCS in ECC you may however create your custom one.

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