How To Fix RTCMMD406 - Hierarchy level 1 cannot be defined as a category level

RTCMMD406 - Overview

• Message type: E = Error

• Message class: RTCMMD - Article Hierarchy

• Message number: 406

• Message text: Hierarchy level 1 cannot be defined as a category level

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message RTCMMD406 - Hierarchy level 1 cannot be defined as a category level ?

  The SAP error message RTCMMD406 indicates that there is an issue with the configuration of a hierarchy in the context of Master Data Management (MDM) or similar areas where hierarchical structures are used. Specifically, the error states that "Hierarchy level 1 cannot be defined as a category level." This typically means that the system is trying to assign a category level to the top level of a hierarchy, which is not allowed.
  
  Cause:
  
  Hierarchy Configuration: The error usually arises when the hierarchy is not configured correctly. In SAP, the top level of a hierarchy (level 1) is generally reserved for the overall category and cannot be treated as a sub-category or a category level.
  Data Model Issues: There may be issues with the data model where the hierarchy is defined, leading to conflicts in how levels are categorized.
  Incorrect Settings: The settings in the hierarchy definition may not align with the expected structure, leading