How To Fix RSDD_LM018 - Field '&1' of provider (union) '&2' has already been added

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD_LM - Messages for Lean Modeler (API and RSLIMO)

• Message number: 018

• Message text: Field '&1' of provider (union) '&2' has already been added

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 RSDD_LM018 - Field '&1' of provider (union) '&2' has already been added ?

  The SAP error message RSDD_LM018 indicates that there is a problem with a data provider (specifically a union provider) in SAP BW (Business Warehouse). The error message states that a field (denoted as '&1') has already been added to the provider (denoted as '&2'). This typically occurs during the modeling of InfoProviders, particularly when working with Union or MultiProvider objects.
  Cause:
  The error is usually caused by one of the following reasons:
  
  Duplicate Field Definition: The field you are trying to add to the union provider has already been defined in the provider. This can happen if you are trying to include the same field from multiple data sources or if the field is already part of the union definition.
  Incorrect Mapping: There may be an issue with how fields are mapped from the underlying data sources to the union provider.
  Modeling Errors: Errors in the modeling process, such as incorrect joins or unions, can lead to this issue.
  
  Solution:
  To resolve the RSDD_LM018 error, you can take the following steps:
  
  
  Check Field Definitions:
  
  Review the fields that are being added to the union provider. Ensure that you are not trying to add the same field more than once.
  If a field is already included in the union provider, you should not attempt to add it again.
  
  
  
  Review Data Sources:
  
  Check the underlying data sources that are being used in the union provider. Make sure that the fields from these sources do not overlap in a way that would cause duplication.
  
  
  
  Adjust the Union Provider:
  
  If you find that a field is indeed duplicated, you may need to remove the duplicate field from one of the data sources or adjust the union provider to ensure that each field is only included once.
  
  
  
  Revalidate the Model:
  
  After making changes, revalidate the union provider to ensure that there are no further errors. You can do this by using the "Check" function in the modeling tool.
  
  
  
  Transport and Activate:
  
  Once the changes are made and validated, transport the changes to the appropriate environment and activate the provider.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or fixes related to this error.
  Documentation: Refer to the SAP BW documentation for best practices on modeling InfoProviders, especially when working with unions and multi-providers.
  Community Forums: Consider searching or posting in SAP community forums for additional support from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the RSDD_LM018 error and successfully model your union provider in SAP BW.