How To Fix RSAN_MDL105 - Assignment is not possible; source and target have already been assigned

SAP Error Message - Details

• Message type: E = Error

• Message class: RSAN_MDL - Messages on Analysis Object Model

• Message number: 105

• Message text: Assignment is not possible; source and target have already been assigned

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 RSAN_MDL105 - Assignment is not possible; source and target have already been assigned ?

  The SAP error message RSAN_MDL105 indicates that there is an issue with the assignment of a source and target in the context of SAP BW (Business Warehouse) or SAP BW/4HANA. This error typically occurs when you are trying to assign a data source to a target (like an InfoProvider or a DataStore Object) that has already been assigned to another source or target.
  Cause:
  
  Duplicate Assignment: The most common cause of this error is that the source (e.g., a DataSource) is already assigned to a target (e.g., an InfoCube or a DataStore Object) and you are attempting to assign it again to a different target.
  Incorrect Configuration: There may be a misconfiguration in the data flow or in the modeling of the InfoProviders.
  DataSource Already in Use: The DataSource you are trying to assign might already be in use in another process or data flow.
  
  Solution:
  
  
  Check Existing Assignments: 
  
  Go to the Data Warehousing Workbench (transaction RSA1) and check the existing assignments of the DataSource and the target InfoProvider. Ensure that the DataSource is not already assigned to another target.
  
  
  
  Remove Existing Assignment: 
  
  If you find that the DataSource is already assigned to a different target and you want to reassign it, you will need to remove the existing assignment first. This can be done in the DataSource settings.
  
  
  
  Use a Different DataSource: 
  
  If the DataSource is required for multiple targets, consider creating a new DataSource or using a different one that can be assigned to the target you are working with.
  
  
  
  Check for Transport Requests: 
  
  If you are working in a development environment and have transported objects, ensure that the transport did not create conflicts in assignments.
  
  
  
  Review Data Flow: 
  
  Review the data flow and ensure that the design is correct. Sometimes, re-evaluating the data model can help identify issues.
  
  
  
  Related Information:
  
  Transaction Codes: Use transaction codes like RSA1 (Data Warehousing Workbench) to manage DataSources and InfoProviders.
  Documentation: Refer to SAP Help documentation for detailed information on DataSource and InfoProvider assignments.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Community Forums: Engage with SAP community forums or support for additional insights and troubleshooting steps.
  
  By following these steps, you should be able to resolve the RSAN_MDL105 error and successfully manage your DataSource and target assignments in SAP BW.