How To Fix MW173 - Order type &1 not allowed (&3, &4) for purchase order (&2)

MW173 - Overview

• Message type: E = Error

• Message class: MW - Messages IS-R / Allocation Tables

• Message number: 173

• Message text: Order type &1 not allowed (&3, &4) for purchase order (&2)

What causes this issue?

The system checked whether purchase order (&V2&) can be generated using
order type &V1&. Due to the current Customizing settings, this is not
possible.
It then checked if the purchase order can be generated using the SAP
standard order types "NB" and "UB". This is also not possible.
The error occurred in allocation table item: &V3& (at distribution
center / plant: &V4&)
Possible causes:
SAP standard order types "NB" and "UB" do not exist or were changed.
Order type &V1& has not been correctly maintained.
Item categories for order type &V1& have not been correctly maintained.

System Response

INCLUDE ISR_VERARBEITUNG

How to fix this error?

Maintain the order types in Customizing and the required item
categories.
In Customizing, also check the <DS:SIMG.W_ZF_VK_0420>Item categories of
alloction table</>. Please note that changes to the item category of
the allocation table only affect allocation table items created after
you make the change.
INCLUDE ISR_CUSTOMIZING OBJECT DOKU ID TX

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MW173 - Order type &1 not allowed (&3, &4) for purchase order (&2) ?

  The SAP error message MW173 indicates that there is an issue with the order type specified in a purchase order. This error typically arises when the order type being used is not allowed for the specific transaction or configuration in the system. Here’s a breakdown of the cause, potential solutions, and related information for this error:
  
  Cause:
  
  Invalid Order Type: The order type specified in the purchase order is not configured or allowed in the system for the transaction you are trying to perform.
  
  Configuration Issues: The order type may not be set up correctly in the system configuration (e.g., in the purchasing or materials management settings).
  Document Type Restrictions: Certain document types may have restrictions based on the company code, purchasing organization, or other criteria.
  User Authorizations: The user may not have the necessary authorizations to create or process the specified order type.
  
  
  Solution:
  
  
  Check Order Type Configuration:
  
  Go to the configuration settings in SAP (Transaction code