How To Fix CJ306 - No multiple selection (choose only one option)

SAP Error Message - Details

• Message type: E = Error

• Message class: CJ - Project master data and structure

• Message number: 306

• Message text: No multiple selection (choose only one option)

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 CJ306 - No multiple selection (choose only one option) ?

  The SAP error message CJ306 "No multiple selection (choose only one option)" typically occurs in the context of project management or controlling transactions, particularly when dealing with project definitions, WBS elements, or other related objects. This error indicates that the system expects a single selection but has detected multiple selections or an invalid selection.
  Cause:
  
  Multiple Selections: The user has selected more than one option in a field that only allows a single selection.
  Incorrect Input: The user may have inadvertently selected multiple items in a dropdown or list where only one is permitted.
  Configuration Issues: There may be a configuration setting in the SAP system that restricts the selection to a single option.
  
  Solution:
  
  Review Selections: Go back to the selection screen and ensure that only one option is selected. Deselect any additional options that may have been inadvertently chosen.
  Check Input Fields: If there are multiple input fields, ensure that you are filling out the correct one and not mixing up fields that allow multiple selections with those that do not.
  Consult Documentation: Refer to the SAP documentation or help files related to the specific transaction you are using to understand the selection requirements.
  System Configuration: If you believe the error is due to a configuration issue, consult with your SAP administrator or technical team to review the settings related to the transaction or module you are working with.
  
  Related Information:
  
  Transaction Codes: This error can occur in various transaction codes related to project management, such as CJ01 (Create Work Breakdown Structure), CJ02 (Change Work Breakdown Structure), or CJ20N (Project Builder).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Training: Ensure that users are trained on the specific requirements of the transactions they are using to minimize the occurrence of this error.
  
  If the problem persists after following these steps, it may be beneficial to reach out to SAP support for further assistance.