How To Fix MC680 - Projection views may not contain more than one table

SAP Error Message - Details

• Message type: E = Error

• Message class: MC - Aggregate: views, matchcodes, lock objects

• Message number: 680

• Message text: Projection views may not contain more than one table

What causes this issue?

Projection views are used to mask fields out of a table. A
projection view may therefore contain only one primary table.

System Response

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

How to fix this error?

Change the view type or remove the secondary tables.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC680 - Projection views may not contain more than one table ?

  The SAP error message MC680, which states "Projection views may not contain more than one table," typically occurs in the context of SAP's data modeling and reporting tools, particularly when working with projection views in the context of the SAP BW (Business Warehouse) or SAP HANA environments.
  Cause:
  The error arises when you attempt to create or use a projection view that includes more than one table. Projection views are designed to represent a single table or a specific subset of data from a single table. When you try to include multiple tables in a projection view, the system generates this error because it violates the fundamental design principle of projection views.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the View Definition: Check the definition of the projection view you are trying to create or use. Ensure that it only references a single table.
  
  
  Create Separate Views: If you need to combine data from multiple tables, consider creating separate projection views for each table and then use other types of views (like join views or union views) to combine the data as needed.
  
  
  Use Join Views: If your requirement is to combine data from multiple tables, consider using a join view instead of a projection view. Join views allow you to combine data from multiple tables based on specified join conditions.
  
  
  Check for Dependencies: If the projection view is being used in other objects (like queries or reports), ensure that those objects are updated to reflect the changes made to the view.
  
  
  Consult Documentation: Refer to the SAP documentation for more details on the types of views and their appropriate use cases. This can provide insights into how to structure your data models effectively.
  
  
  Related Information:
  
  SAP BW and HANA Documentation: Review the official SAP documentation for BW and HANA to understand the differences between projection views, join views, and other types of views.
  SAP Community Forums: Engage with the SAP community forums or support channels for additional insights and solutions from other users who may have encountered similar issues.
  Training and Tutorials: Consider taking training courses or tutorials on SAP data modeling to better understand how to work with different types of views and data structures.
  
  By following these steps, you should be able to resolve the MC680 error and effectively manage your projection views in SAP.