How To Fix SWF_EXP_001204 - Byte code contains invalid unit '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: SWF_EXP_001 - Expression Service Messages

• Message number: 204

• Message text: Byte code contains invalid unit '&1'

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 SWF_EXP_001204 - Byte code contains invalid unit '&1' ?

  The SAP error message SWF_EXP_001204 indicates that there is an issue with the byte code in a workflow, specifically that it contains an invalid unit represented by &1. This error typically arises in the context of SAP Business Workflow when there is a problem with the workflow definition or the underlying code that is being executed.
  Cause:
  
  Invalid Unit Reference: The error suggests that there is a reference to a unit that is not recognized or is incorrectly defined in the workflow.
  Corrupted Workflow: The workflow definition may be corrupted or not properly activated.
  Inconsistent Data: There may be inconsistencies in the data being processed by the workflow, leading to invalid references.
  Transport Issues: If the workflow was transported from one system to another, there may be missing dependencies or incorrect configurations.
  
  Solution:
  
  Check Workflow Definition: Review the workflow definition in transaction SWDD (Workflow Builder) to ensure that all units and references are correctly defined and activated.
  Rebuild the Workflow: If the workflow appears to be corrupted, consider rebuilding it or restoring it from a backup if available.
  Activate Workflow: Ensure that the workflow is activated properly. You can do this in the Workflow Builder by selecting the workflow and choosing the activation option.
  Check for Missing Objects: Verify that all objects (like tasks, events, etc.) referenced in the workflow are available and correctly configured in the system.
  Review Transport Logs: If the workflow was transported, check the transport logs for any errors or warnings that might indicate missing objects or dependencies.
  Debugging: If the issue persists, you may need to debug the workflow to identify the exact point of failure. Use transaction SWI1 to monitor workflow instances and check for errors.
  
  Related Information:
  
  Transaction Codes:
  
  SWDD: Workflow Builder
  SWI1: Work Item Selection
  SWI2_FREQ: Work Item Selection for Recurrent Tasks
  
  
  SAP Notes: Check SAP Notes related to workflow errors for any patches or updates that may address this specific issue.
  Documentation: Refer to SAP Help documentation for workflows to understand the structure and requirements for defining workflows correctly.
  
  If the problem continues after trying the above solutions, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the context in which it occurs.