How To Fix B1503 - Message type & already exists in system

B1503 - Overview

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 503

• Message text: Message type & already exists in system

What causes this issue?

The message type &v1& you specified has already been defined for other
applications.

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?

Specify a new message type.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B1503 - Message type & already exists in system ?

  The SAP error message B1503 ("Message type & already exists in system") typically occurs when you are trying to create a new message type in the SAP system that already exists. This can happen in various contexts, such as when configuring message types for output processing in modules like Sales and Distribution (SD) or Materials Management (MM).
  
  Cause:
  
  Duplicate Entry: The primary cause of this error is that the message type you are trying to create is already defined in the system. Each message type must be unique within the SAP system.
  Configuration Error: It may also occur if there is a misunderstanding in the configuration process, leading to attempts to create a message type that is already present.
  
  
  Solution:
  
  
  Check Existing Message Types:
  
  Go to the relevant configuration transaction (e.g., NACE for output types).
  Check the list of existing message types to see if the one you are trying to create is already listed.
  If it exists,