How To Fix GRPG028 - Reservation is account assigned to another WBS element (&1) than entry &2

GRPG028 - Overview

• Message type: E = Error

• Message class: GRPG - Grouping/Pegging for Individual Project Planning

• Message number: 028

• Message text: Reservation is account assigned to another WBS element (&1) than entry &2

What causes this issue?

The WBS element, to which the reservation is account assigned, is not
the WBS element you hav entered.
&what_to_do&
Check your entry. If you do not enter a WBS element, the system uses
the WBS element, to which the reservation is account assigned.

Error message extract from SAP system. Copyright SAP SE.

GRPG028 - Details

• The SAP error message GRPG028 indicates that there is a mismatch between the reservation and the Work Breakdown Structure (WBS) element it is assigned to. Specifically, the reservation is linked to a different WBS element than the one you are trying to use or reference in your transaction.
  
  Cause:
  
  Incorrect WBS Element: The reservation you are trying to process is associated with a specific WBS element, but you are attempting to assign it to a different WBS element.
  Data Entry Error: There may have been a mistake in entering the WBS element during the transaction.
  Changes in Project Structure: If the project structure has been modified (e.g., WBS elements have been changed or deleted), it may lead to this error.
  Multiple Assignments: The reservation might have been created for a different project or WBS element, leading to conflicts when trying to reassign it.
  
  
  Solution:
  
  Verify WBS Element: Check the WBS element associated with the reservation. You can