How To Fix CJ601 - Mask must begin with letter &

SAP Error Message - Details

• Message type: E = Error

• Message class: CJ - Project master data and structure

• Message number: 601

• Message text: Mask must begin with letter &

What causes this issue?

The special character that you used for coding the project definition
of the WBS element is not recognized by the system.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Check if you have entered the right special character. Change it, if
necessary.
INCLUDE 'NA_ALLG_VORGEHEN' OBJECT DOKU ID TX
Check if the special character that you want to use has been defined.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CJ601 - Mask must begin with letter & ?

  The SAP error message CJ601, which states "Mask must begin with letter &," typically occurs in the context of project management or controlling within SAP, particularly when dealing with project definitions, work breakdown structures (WBS), or internal orders. This error indicates that the identifier (mask) you are trying to use does not conform to the naming conventions required by the system.
  Cause:
  
  Invalid Naming Convention: The identifier (mask) you are trying to create or use does not start with a letter. In SAP, certain fields, especially those related to project management, must begin with a letter (A-Z).
  Data Entry Error: There may have been a typographical error when entering the mask, such as starting it with a number or special character.
  Configuration Issues: In some cases, the system configuration may enforce specific naming conventions that are not being adhered to.
  
  Solution:
  
  Check the Identifier: Ensure that the mask you are trying to use starts with a letter. For example, instead of using "1234" or "#Project1", use "P1234" or "Project1".
  Modify the Input: If you have already entered a mask that is causing the error, go back and modify it to comply with the naming convention.
  Consult Documentation: Review the relevant SAP documentation or guidelines for naming conventions in your specific module (e.g., Project System, Controlling) to ensure compliance.
  System Configuration: If you believe the naming convention is too restrictive or needs to be changed, consult with your SAP administrator or technical team to review the configuration settings.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any updates or patches related to this error message. Sometimes, specific issues are documented with solutions or workarounds.
  Transaction Codes: Familiarize yourself with relevant transaction codes (like CJ01 for creating project definitions, CJ02 for changing them, etc.) to navigate the project management module effectively.
  User Training: If this error is common among users, consider providing training or guidelines on proper naming conventions within your organization.
  
  By ensuring that all identifiers start with a letter and conform to the required naming conventions, you should be able to resolve the CJ601 error.