How To Fix MCW_AA128 - The OLTP field name of a variable field can only have & characters

SAP Error Message - Details

• Message type: E = Error

• Message class: MCW_AA - Messages for BW Interface Analytical Applications

• Message number: 128

• Message text: The OLTP field name of a variable field can only have & characters

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MCW_AA128 - The OLTP field name of a variable field can only have & characters ?

  The SAP error message MCW_AA128 indicates that there is an issue with the naming convention of a variable field in the context of OLTP (Online Transaction Processing) data. Specifically, the error states that the OLTP field name of a variable field can only contain the "&" character.
  Cause:
  This error typically arises when:
  
  The field name defined for a variable in a query or report does not adhere to the naming conventions expected by SAP.
  The field name may contain invalid characters or does not follow the required format, which is restricted to the "&" character.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Field Name: Review the field name that is causing the error. Ensure that it only contains valid characters, specifically the "&" character, and does not include any other special characters or spaces.
  
  
  Modify the Variable Field:
  
  If you are using a custom variable, go to the relevant configuration or definition area in SAP.
  Change the field name to comply with the naming conventions. For example, if your field name is Sales_Amount, you might need to change it to Sales&Amount.
  
  
  
  Recreate the Variable: If modifying the field name does not resolve the issue, consider deleting the variable and recreating it with a valid name.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on naming conventions for OLTP fields and variables.
  
  
  Testing: After making the changes, test the report or query again to ensure that the error is resolved.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific notes related to this error message. SAP frequently updates its knowledge base with solutions for common issues.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can provide insights or solutions.
  Transaction Codes: Familiarize yourself with relevant transaction codes (like SE11 for Data Dictionary, SE80 for Object Navigator) that can help you navigate and modify field definitions.
  
  By following these steps, you should be able to resolve the MCW_AA128 error and ensure that your variable field names comply with SAP's requirements.