How To Fix C_300 - Mass data handling is not allowed in combination with complex structures

C_300 - Overview

• Message type: E = Error

• Message class: C_ - CRM Integration Messages

• Message number: 300

• Message text: Mass data handling is not allowed in combination with complex structures

What causes this issue?

You can use complex structures during data transfer when processing
object &V1& (object class &V2&). Mass data handling should
not be activated for this object.
If the object class is masked (' * '), none of the objects in this
object class should have usage of complex structures activated.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

C_300 - Details

• The SAP error message C_300, which states "Mass data handling is not allowed in combination with complex structures," typically occurs when you are trying to perform mass data operations (like mass uploads or updates) on data structures that are considered complex. This can happen in various contexts, such as when using transaction codes for mass changes or uploads, or when working with certain data models that involve nested or hierarchical structures.
  
  Cause:
  
  Complex Structures: The error arises because the data structure you are trying to manipulate is complex, meaning it may involve multiple levels of data or relationships that cannot be handled in a single mass operation.
  Transaction Limitations: Certain SAP transactions or programs are designed to handle simple flat structures and do not support complex data types or relationships.
  Data Integrity: SAP enforces this restriction to maintain data integrity and ensure that complex relationships are correctly managed.
  
  
  Solution:
  
  Break Down the Data: Instead of trying