How To Fix 1R501 - & is not a valid class for information objects

1R501 - Overview

• Message type: E = Error

• Message class: 1R - SAP Knowledge Provider

• Message number: 501

• Message text: & is not a valid class for information objects

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 1R501 - & is not a valid class for information objects ?

  The SAP error message 1R501 indicates that the specified class is not valid for information objects. This error typically arises in the context of SAP BW (Business Warehouse) or SAP BI (Business Intelligence) when dealing with InfoObjects, which are the building blocks of data modeling in SAP BW.
  
  Cause:
  The error can occur due to several reasons:
  
  Incorrect Class Assignment: The InfoObject may be assigned to a class that is not appropriate for its type or usage.
  Missing or Inactive Class: The class that is being referenced may not exist, or it may be inactive in the system.
  
  Configuration Issues: There may be issues in the configuration of the InfoObject or the class itself.
  Transport Issues: If the InfoObject was transported from another system, there may be inconsistencies in the transport that lead to this error.
  
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Class Assignment:
  
  Go to the InfoObject maintenance transaction (e.g., RSA1) and check