How To Fix ON155 - Redundantly displayed object types were selected

ON155 - Overview

• Message type: E = Error

• Message class: ON - Tools in area Object Modeler / Object Editor

• Message number: 155

• Message text: Redundantly displayed object types were selected

What causes this issue?

You have chosen Edit->Select on/off->Redundant object types. On this
and the following screens all object types which appear repeatedly in
the tree and correspond to the selected set will be displayed as
selected.
In addition to this, subtrees may be expanded, so that you can see the
selected redundant object types.

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?

No action is required. This is just for your information.

Error message extract from SAP system. Copyright SAP SE.

ON155 - Details

• The SAP error message ON155, which states "Redundantly displayed object types were selected," typically occurs in the context of object selection in SAP, particularly when dealing with object types in a transaction or report that allows for multiple selections. This error indicates that the user has selected the same object type more than once, which is not allowed.
  
  Cause:
  The primary cause of this error is the selection of the same object type multiple times in a selection screen or a report. For example, if you are trying to select multiple object types (like different materials, customers, or vendors) and you inadvertently select the same object type more than once, SAP will trigger this error.
  
  Solution:
  To resolve the ON155 error, follow these steps:
  
  
  Review Your Selections: Go back to the selection screen where you made your selections. Carefully check the list of selected object types.
  
  
  Remove Duplicates: If you find that you have selected the