How To Fix RS2HANA_VIEW149 - External SAP HANA view: Use of optional variables not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: RS2HANA_VIEW - HANA Views for BW Objects

• Message number: 149

• Message text: External SAP HANA view: Use of optional variables not supported

What causes this issue?

Per selection, per characteristic only one variable with entry type
optional is allowed.

System Response

External SAP HANA view is not supported.

How to fix this error?

Change the entry type of the variable or remove the variable.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RS2HANA_VIEW149 - External SAP HANA view: Use of optional variables not supported ?

  The error message "RS2HANA_VIEW149 External SAP HANA view: Use of optional variables not supported" typically occurs in the context of SAP BW/4HANA or SAP BW on HANA when you are trying to use optional variables in a HANA view that is being consumed by a BW query or report. This error indicates that the HANA view you are trying to use does not support optional variables, which can lead to issues when trying to execute queries that rely on these variables.
  Cause:
  
  Optional Variables: The error arises because the HANA view is designed in such a way that it does not support optional variables. Optional variables are those that can be left blank or not provided when executing a query.
  HANA View Design: The design of the HANA view may not accommodate the logic required to handle optional variables, which can lead to runtime errors when the query is executed.
  BW Query Configuration: The BW query may be configured to use optional variables that are not compatible with the underlying HANA view.
  
  Solution:
  
  Review HANA View: Check the design of the HANA view to ensure that it can handle the variables being passed. If optional variables are necessary, consider redesigning the view to accommodate them.
  Modify BW Query: If possible, modify the BW query to remove the use of optional variables. Instead, use mandatory variables or default values that can be passed to the HANA view.
  Use Input Parameters: If the HANA view can be modified, consider using input parameters instead of optional variables. Input parameters can be defined in a way that they are always required, thus avoiding the issue.
  Consult Documentation: Refer to SAP documentation for guidelines on how to handle variables in HANA views and BW queries. This can provide insights into best practices and potential workarounds.
  Testing: After making changes, thoroughly test the BW query to ensure that it executes correctly without errors.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling optional variables in HANA views.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  Training and Documentation: Consider reviewing training materials or documentation related to SAP BW/4HANA and HANA view design to better understand how to work with variables effectively.
  
  By addressing the design of the HANA view and the configuration of the BW query, you should be able to resolve the error and ensure smooth execution of your reports and queries.