How To Fix KK156 - The objects selected cannot be inserted inside each other

KK156 - Overview

• Message type: E = Error

• Message class: KK -

• Message number: 156

• Message text: The objects selected cannot be inserted inside each other

What causes this issue?

Not all objects that can be moved using drag and drop in multilevel
unit costing can be inserted into other objects.

System Response

The drag and drop operation is not carried out by the system.
The following drag and drop combinations apply:
Material cost estimates and base planning objects can be inserted into
the 'Costing structure' node
No objects can be inserted into material cost estimates with quantity
structure
Material cost estimates both with and without quantity structure can be
inserted into material cost estimates without quantity structure, as
can base planning objects. The following costing items can also be
inserted:
Internal activities
Manual processes
External activities
Subcontracting items
Services
Base planning objects (excluding material cost estimates) can be
inserted into other base planning objects, as can as the following
costing items:
Internal activities
Manual processes
External activities
Subcontracting items
Services
The following can be inserted into worklist containers (depending on
the type of container, either all or one of the following can be
contained)
:
Material cost estimates with and without quantity structure
Base planning objects
Internal activities
Manual processes
External activities
Subcontracting items
Services

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message KK156 - The objects selected cannot be inserted inside each other ?

  The SAP error message KK156 ("The objects selected cannot be inserted inside each other") typically occurs in the context of the SAP Controlling (CO) module, particularly when dealing with cost centers, internal orders, or other organizational units. This error indicates that there is an attempt to create a hierarchical relationship between objects that are not compatible.
  
  Cause:
  The error arises when you try to insert one object (like a cost center or internal order) into another object that is not allowed by the system's hierarchy rules. Common causes include:
  
  Incompatible Object Types: You may be trying to insert a cost center into a profit center or an internal order into a cost center, which is not permitted.
  Hierarchy Restrictions: The objects may have predefined relationships that do not allow them to be nested within each other.
  Incorrect Selection: You might have selected the wrong objects for insertion, leading to a conflict.
  
  
  Solution:
  To resolve the KK156 error,