How To Fix CJ756 - Character is already used as first character in an edit screen

SAP Error Message - Details

• Message type: E = Error

• Message class: CJ - Project master data and structure

• Message number: 756

• Message text: Character is already used as first character in an edit screen

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CJ756 - Character is already used as first character in an edit screen ?

  The SAP error message CJ756, which states "Character is already used as first character in an edit screen," typically occurs in the context of project management or when working with certain transaction codes related to project structures, such as CJ20N (Project Builder) or CJ01 (Create Work Breakdown Structure).
  Cause:
  This error usually arises when there is an issue with the input data in the fields of the edit screen. Specifically, it indicates that the first character of a field you are trying to enter is already being used in another field or is not allowed due to system constraints. This can happen due to:
  
  Duplicate Entries: The first character of the input is already in use in the same context or screen.
  Field Restrictions: Certain fields may have restrictions on the characters that can be used, especially if they are meant to be unique identifiers.
  Data Validation Rules: The system may have validation rules that prevent certain characters from being used as the first character in specific fields.
  
  Solution:
  To resolve the CJ756 error, you can take the following steps:
  
  
  Check Input Fields: Review the fields you are trying to enter data into. Ensure that the first character of your input does not conflict with existing entries in the same context.
  
  
  Change the First Character: If the first character is causing the issue, try changing it to a different character that is not already in use.
  
  
  Review Field Requirements: Consult the documentation or field help to understand any restrictions on the characters that can be used in the fields you are working with.
  
  
  Clear Cache: Sometimes, clearing the SAP GUI cache or refreshing the session can help resolve temporary issues.
  
  
  Consult with SAP Support: If the issue persists, consider reaching out to your SAP support team or consulting SAP Notes for any known issues related to this error.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with the transaction codes related to project management, such as CJ20N, CJ01, CJ02, etc.
  SAP Notes: Check SAP Notes for any updates or patches that may address this error.
  User Documentation: Review user manuals or guides specific to the project management module in SAP for best practices and field usage.
  
  By following these steps, you should be able to identify the cause of the CJ756 error and implement a solution to resolve it.