How To Fix MTG_EMAIL015 - CDS view must not be changed for customer templates

MTG_EMAIL015 - Overview

• Message type: E = Error

• Message class: MTG_EMAIL - E-Mail API Messages

• Message number: 015

• Message text: CDS view must not be changed for customer templates

Self-Explanatory Message

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MTG_EMAIL015 - Details

• The SAP error message MTG_EMAIL015 indicates that there is an issue with a Core Data Services (CDS) view that is being modified in a way that is not allowed for customer templates. This error typically arises in the context of SAP S/4HANA or SAP Fiori applications where CDS views are used to define data models.
  
  Cause:
  The error occurs because:
  
  Modification Restrictions: SAP restricts changes to certain CDS views that are part of standard templates or applications. This is to ensure that the integrity and functionality of the standard application are maintained.
  Custom Development: If a customer attempts to modify a standard CDS view directly, it can lead to inconsistencies and issues during upgrades or when applying patches.
  
  
  Solution:
  To resolve this error, consider the following approaches:
  
  
  Use of Custom CDS Views: Instead of modifying the standard CDS view, create a custom CDS view that references the standard view. This allows you to extend or modify the