How To Fix MC778 - Field &: Position relative to Basis table cannot be exchanged

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 778

• Message text: Field &: Position relative to Basis table cannot be exchanged

What causes this issue?

You have defined a projection view. Here, fields from the Basis table
can be omitted. The sequence of the included fields, however, must match
the sequence in the Basis table. This is not the case in this projection
view.

System Response

The view is not activated.

How to fix this error?

Put the view fields into the sequence as they are in the Basis table.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC778 - Field &: Position relative to Basis table cannot be exchanged ?

  The SAP error message MC778, which states "Field &: Position relative to Basis table cannot be exchanged," typically occurs in the context of SAP's Material Management (MM) or Logistics modules when there is an issue with the configuration of Info Structures or when trying to modify the structure of a data table.
  Cause:
  
  Field Configuration Issues: The error often arises when there is an attempt to change the position of a field in an Info Structure that is not allowed. This can happen if the field is part of a key or if it is being used in a way that conflicts with its current configuration.
  Data Consistency: If there are existing data records that rely on the current structure, changing the position of fields can lead to inconsistencies.
  Technical Restrictions: Certain fields may have restrictions based on their data type or the way they are used in the system.
  
  Solution:
  
  Check Field Usage: Review the Info Structure and the fields involved. Ensure that the field you are trying to move is not a key field or being used in a way that prevents it from being repositioned.
  Modify Info Structure: If you need to change the position of a field, consider creating a new Info Structure instead of modifying the existing one. This can help avoid conflicts with existing data.
  Data Migration: If you create a new Info Structure, you may need to migrate data from the old structure to the new one. Ensure that you have a backup and a clear migration plan.
  Consult Documentation: Refer to SAP documentation or notes related to Info Structures and field configurations for specific guidelines and best practices.
  SAP Support: If the issue persists, consider reaching out to SAP support for assistance, especially if this is a production environment.
  
  Related Information:
  
  Info Structures: Understand how Info Structures work in SAP and the implications of changing field positions.
  Data Dictionary: Familiarize yourself with the Data Dictionary (SE11) to see how fields are defined and used.
  Transaction Codes: Use transaction codes like MC22 (to change Info Structures) and MC28 (to display Info Structures) to manage and review your Info Structures.
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide additional context.
  
  By following these steps, you should be able to resolve the MC778 error and understand the underlying issues related to field positioning in SAP Info Structures.