How To Fix MD_SUBSTN064 - Only alphanumeric characters and underscores are allowed &1

SAP Error Message - Details

• Message type: E = Error

• Message class: MD_SUBSTN - Messages for Master Data Substitution

• Message number: 064

• Message text: Only alphanumeric characters and underscores are allowed &1

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 MD_SUBSTN064 - Only alphanumeric characters and underscores are allowed &1 ?

  The SAP error message MD_SUBSTN064 indicates that a certain field or input does not meet the required format, specifically that it only allows alphanumeric characters (letters and numbers) and underscores. This error typically occurs in the context of master data management, particularly when dealing with material master data, batch management, or similar areas where identifiers or names are being defined.
  Cause:
  The error is triggered when a user attempts to enter a value that contains invalid characters in a field that is restricted to alphanumeric characters and underscores. Common causes include:
  
  Special characters (e.g., spaces, punctuation, symbols) being included in the input.
  Leading or trailing spaces in the input.
  Incorrect formatting of identifiers or names.
  
  Solution:
  To resolve the error, follow these steps:
  
  Check Input: Review the input value that triggered the error. Ensure that it contains only letters (A-Z, a-z), numbers (0-9), and underscores (_).
  Remove Invalid Characters: If there are any special characters or spaces, remove them. For example, if the input is "Material#1", change it to "Material_1".
  Trim Spaces: Ensure there are no leading or trailing spaces in the input. You can use the TRIM function in many programming environments to remove these.
  Re-enter the Value: After making the necessary corrections, re-enter the value in the relevant field and try to save or process again.
  
  Related Information:
  
  Field Specifications: Check the documentation or field specifications for the specific field you are working with to understand the allowed character set and length restrictions.
  SAP Notes: If the issue persists or if you believe it is a bug, check SAP Notes for any related issues or patches that may address this error.
  User Training: Ensure that users are trained on the input requirements for the system to minimize the occurrence of such errors in the future.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP support team for further assistance.