How To Fix MAT_MESSAGES013 - Only one '&1' is allowed.

SAP Error Message - Details

• Message type: E = Error

• Message class: MAT_MESSAGES -

• Message number: 013

• Message text: Only one '&1' is allowed.

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 MAT_MESSAGES013 - Only one '&1' is allowed. ?

  The SAP error message MAT_MESSAGES013 with the description "Only one '&1' is allowed" typically occurs in the context of material master data management. This error indicates that there is an attempt to create or modify a material master record in a way that violates a business rule or configuration setting that allows only one instance of a specific attribute or characteristic.
  Cause:
  The error can arise from several scenarios, including but not limited to:
  
  Duplicate Entries: You may be trying to create or update a material with a characteristic that is supposed to be unique, such as a specific classification or attribute that can only have one value.
  Configuration Settings: The system may be configured to restrict certain attributes to a single entry, and your action is attempting to add more than one.
  Data Inconsistencies: There may be inconsistencies in the data being entered, such as trying to assign multiple values to a field that is designed to hold only one.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Data: Review the existing material master data to ensure that the attribute or characteristic you are trying to modify or create does not already exist. If it does, you may need to update the existing entry instead of creating a new one.
  
  
  Review Configuration: If you have access to the configuration settings, check the settings for the material master data to understand the rules governing the attributes. This may involve looking into the classification system or the specific fields that are causing the error.
  
  
  Correct Input Data: Ensure that the data you are entering complies with the business rules. If you are trying to enter multiple values for a field that only allows one, you will need to adjust your input accordingly.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on the material master data management process and the rules that apply to the attributes you are working with.
  
  
  Seek Help from SAP Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting SAP Notes for any known issues related to this error message.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM01 (Create Material), MM02 (Change Material), and MM03 (Display Material) to navigate the material master data effectively.
  SAP Notes: Check SAP Notes for any updates or patches that may address this error or provide additional context.
  User Roles and Authorizations: Ensure that you have the necessary permissions to make changes to the material master data, as restrictions may also lead to errors.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.