How To Fix WW419 - Block operations only possible below hierarchy branch level (example: MG)

WW419 - Overview

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 419

• Message text: Block operations only possible below hierarchy branch level (example: MG)

What causes this issue?

You attempted to select different types of object (materials groups and
materials, for example) in the same step. This is not allowed.

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?

Only select objects of the same category in the same step.

Error message extract from SAP system. Copyright SAP SE.

WW419 - Details

• The SAP error message WW419, which states "Block operations only possible below hierarchy branch level (example: MG)," typically occurs in the context of working with hierarchical data structures in SAP, such as when dealing with master data or organizational structures. This error indicates that the operation you are trying to perform is not allowed at the current level of the hierarchy.
  
  Cause:
  
  Hierarchy Level: The error arises when you attempt to perform a block operation (like mass changes or deletions) at a level in the hierarchy that does not support such operations. For example, if you are trying to make changes at a higher level (like a top-level node) instead of a lower branch level (like a specific department or cost center).
  Data Structure: The data structure you are working with may have restrictions on where certain operations can be performed. Block operations are typically allowed only at specific levels of the hierarchy.
  
  
  Solution:
  
  Identify