How To Fix TT121 - '&1 (&2)' not allowed as source because there is a &3

TT121 - Overview

• Message type: E = Error

• Message class: TT - Extended Computer Aided Test Tool (eCATT) messages

• Message number: 121

• Message text: '&1 (&2)' not allowed as source because there is a &3

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 TT121 - '&1 (&2)' not allowed as source because there is a &3 ?

  The SAP error message TT121 '&1 (&2)' not allowed as source because there is a &3 typically occurs in the context of data transfer or data source configuration within SAP systems, particularly in the context of SAP BW (Business Warehouse) or data modeling.
  
  Cause:
  This error message indicates that the specified source (e.g., a data source or a table) is not allowed to be used because there is a restriction or a conflict with another object or setting. The placeholders in the message represent:
  
  &1: The name of the object (e.g., data source or table).
  &2: The technical name or identifier of the object.
  &3: The reason for the restriction (e.g., a specific condition or another object that conflicts).
  
  Common causes for this error include:
  
  Data Source Restrictions: The data source may be restricted due to its configuration or the type of data it contains.
  Incompatible Data Types: The data types of the source and target may not