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

CJ756 - Overview

• 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.

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

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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