How To Fix MC819 - & & and proxy view & have different numbers of columns

MC819 - Overview

• Message type: E = Error

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

• Message number: 819

• Message text: & & and proxy view & have different numbers of columns

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 MC819 - & & and proxy view & have different numbers of columns ?

  The SAP error message MC819 typically indicates a mismatch in the number of columns between a data source and a proxy view in the context of SAP BW (Business Warehouse) or SAP HANA. This error can occur during data extraction, transformation, or loading processes when the structure of the data being processed does not align with the expected structure defined in the proxy view.
  
  Cause:
  
  
  Schema Mismatch: The most common cause of this error is that the data source (e.g., InfoSource, DataSource, or DSO) has a different number of columns than the proxy view that is trying to access it. This can happen if:
  
  The data source has been modified (e.g., columns added or removed) without updating the corresponding proxy view.
  The proxy view was created based on an outdated version of the data source.
  
  
  
  Data Model Changes: Changes in the underlying data model, such as changes in the InfoObject definitions or the structure of