How To Fix KPN028 - There is already an invoicing plan for activity &

KPN028 - Overview

• Message type: E = Error

• Message class: KPN - Costing: Networks, Projects

• Message number: 028

• Message text: There is already an invoicing plan for activity &

What causes this issue?

There is already an invoicing plan for activity &V1&. You cannot create
a unit costing and an invoicing plan simultaneously for an activity.

System Response

You cannot create the unit costing.

How to fix this error?

Delete the invoicing plan if you do not require it any more. You can
then create the unit costing.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KPN028 - There is already an invoicing plan for activity & ?

  The SAP error message KPN028 ("There is already an invoicing plan for activity &") typically occurs in the context of project management or service management when you attempt to create an invoicing plan for an activity that already has an existing invoicing plan associated with it. This can happen in various modules, such as Project System (PS) or Controlling (CO).
  
  Cause:
  The error is triggered because the system detects that an invoicing plan already exists for the specified activity. This is a safeguard to prevent duplicate invoicing plans, which could lead to inconsistencies in billing and financial reporting.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Invoicing Plans:
  
  Navigate to the relevant transaction (e.g., CJ20N for Project System) and check the activity in question to see if an invoicing plan is already defined.
  You can also use transaction codes like KKAO (for internal orders) or KKA1 (for projects) to review existing invoicing