How To Fix WW420 - End of block must be below start of block

SAP Error Message - Details

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 420

• Message text: End of block must be below start of block

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WW420 - End of block must be below start of block ?

  The SAP error message WW420 ("End of block must be below start of block") typically occurs in the context of data processing, particularly when dealing with data blocks in SAP systems. This error indicates that there is a logical inconsistency in the way data blocks are defined or processed, where the end of a block is incorrectly positioned above its start.
  Causes:
  
  Incorrect Data Block Definition: The most common cause is that the data block has been defined incorrectly, where the end position is set to a value that is less than the start position.
  Data Corruption: There may be corruption in the data being processed, leading to incorrect block definitions.
  Program Logic Errors: If a custom program or report is manipulating data blocks, there may be a logic error in the code that leads to this situation.
  Configuration Issues: Misconfiguration in the settings related to data processing or block handling can also lead to this error.
  
  Solutions:
  
  Check Data Block Definitions: Review the definitions of the data blocks in the relevant program or configuration. Ensure that the end position is always greater than the start position.
  Debugging: If the error occurs in a custom program, use the SAP debugger to step through the code and identify where the block definitions are being set incorrectly.
  Data Validation: Validate the data being processed to ensure that it is not corrupted and that all necessary fields are populated correctly.
  Review Configuration: Check the configuration settings related to the data processing to ensure they are set up correctly.
  Consult Documentation: Refer to SAP documentation or notes related to the specific transaction or program to see if there are known issues or patches available.
  Contact SAP Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP support for further assistance.
  
  Related Information:
  
  Transaction Codes: Depending on where the error occurs, you may want to check specific transaction codes related to the process you are working with.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the root cause of the WW420 error and implement a suitable solution.