How To Fix KO318 - Order type & has int. no. assignment; you cannot enter the order number

KO318 - Overview

• Message type: E = Error

• Message class: KO - Master data for CO orders

• Message number: 318

• Message text: Order type & has int. no. assignment; you cannot enter the order number

What causes this issue?

An exception condition can arise because:
Internal number allocation is entered for the order type; however, an
order number is defined in the transfer structure.
The order number set in the transfer structure is not in a valid number
range.
The order number set in the transfer structure already exists in the
database.
The order number set in the transfer structure is already being
processed (errors occurred during order locking).
The order number set in the transfer structure cannot be processed at
all, due to a system error.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KO318 - Order type & has int. no. assignment; you cannot enter the order number ?

  The SAP error message KO318 indicates that you are trying to enter an order number for a production order or a process order that has an internal number assignment. This means that the system is set up to automatically generate order numbers rather than allowing users to manually enter them.
  
  Cause:
  The error occurs because:
  
  The order type you are working with is configured to use internal number assignment.
  You are attempting to manually enter an order number, which is not permitted for that order type.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Use the Correct Transaction: Instead of trying to enter an order number manually, use the appropriate transaction to create a new order. For example, use transaction codes like CO01 (Create Production Order) or COR1 (Create Process Order) to let the system generate the order number automatically.
  
  
  Check Order Type Configuration: If you believe that the order type should allow manual entry,