How To Fix WZRE_ALE_MONITOR2019 - IDoc type differs (&1 <-> &2): Comparison useless

SAP Error Message - Details

• Message type: E = Error

• Message class: WZRE_ALE_MONITOR2 - IDoc Monitor

• Message number: 019

• Message text: IDoc type differs (&1 <-> &2): Comparison useless

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message WZRE_ALE_MONITOR2019 - IDoc type differs (&1 <-> &2): Comparison useless ?

  SAP Error Message:
  
  WZRE_ALE_MONITOR2019
  
  Text: IDoc type differs (&1 <-> &2): Comparison useless
  
  Cause
  This error occurs during ALE (Application Link Enabling) monitoring or IDoc processing when the system tries to compare two IDocs or IDoc types but finds that the IDoc types are different. Because the IDoc types do not match, the system cannot perform a meaningful comparison, rendering the comparison "useless."
  Typical scenarios include:
  
  The sender and receiver systems are expected to exchange IDocs of the same type, but the IDoc types differ.
  A mismatch in the IDoc type definitions between the sending and receiving systems.
  Incorrect partner profiles or message type assignments leading to different IDoc types being processed.
  Transport or configuration inconsistencies where the IDoc type in one system is not aligned with the other.
  
  
  Solution
  
  
  Check IDoc Types:
  
  Verify the IDoc types involved in the communication.
  Use transaction WE30 to check the IDoc types and their segments.
  Ensure that the IDoc types on both sender and receiver sides are identical or compatible.
  
  
  
  Verify Partner Profiles:
  
  Use transaction WE20 to check the partner profiles.
  Confirm that the message types and associated IDoc types are correctly assigned.
  Make sure the outbound and inbound parameters correspond to the correct IDoc types.
  
  
  
  Check ALE Configuration:
  
  Use transaction SALE or BD87 to monitor and reprocess IDocs.
  Check the distribution model (transaction BD64) to ensure the correct message types and IDoc types are distributed.
  
  
  
  Transport and Version Consistency:
  
  Ensure that the IDoc type definitions are consistent across all systems involved (development, quality, production).
  If necessary, transport the IDoc type definitions to align the systems.
  
  
  
  Reprocess or Correct IDocs:
  
  If the error occurs during IDoc processing, reprocess the IDocs after correcting the configuration.
  Use transaction WE19 to test IDoc processing with the correct IDoc type.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  WE30 – IDoc Type Development
  WE20 – Partner Profiles
  BD64 – Distribution Model
  BD87 – IDoc Reprocessing
  WE19 – IDoc Test Tool
  SALE – ALE Monitoring
  
  
  
  Notes and Documentation:
  
  Check SAP Notes related to ALE and IDoc type mismatches.
  Review SAP Help Portal documentation on ALE and IDoc configuration.
  
  
  
  General Advice:
  
  Always ensure that the IDoc types and message types are consistent across all systems in the landscape.
  Regularly synchronize IDoc type definitions after transports.
  Use ALE monitoring tools to detect and resolve inconsistencies early.
  
  
  
  
  Summary:
  
  The error "IDoc type differs (&1 <-> &2): Comparison useless" indicates a mismatch between expected and actual IDoc types during ALE processing. The solution involves verifying and aligning IDoc types, partner profiles, and ALE configuration to ensure consistent communication between systems.