How To Fix SE691 - Combination of these line categories not allowed

SE691 - Overview

• Message type: E = Error

• Message class: SE - Dienstleistungen Stammdaten Leistungsposition

• Message number: 691

• Message text: Combination of these line categories not allowed

What causes this issue?

The combination of contingency lines with alternaltive lines is not
allowed for a service.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SE691 - Combination of these line categories not allowed ?

  The SAP error message SE691, which states "Combination of these line categories not allowed," typically occurs in the context of financial documents, particularly when dealing with line items in a document that are not compatible with each other based on the configuration settings in the system.
  
  Cause:
  This error usually arises due to one or more of the following reasons:
  
  
  Line Category Configuration: The line items in the document may belong to different categories that are not allowed to be combined. For example, you might be trying to mix revenue and expense line items in a way that is not permitted by the system configuration.
  
  
  Document Type Restrictions: Certain document types may have restrictions on the types of line items that can be included. For instance, a specific document type may only allow certain categories of line items.
  
  
  Account Assignment Issues: If the line items are assigned to different account assignment categories (like cost centers,