How To Fix RD306 - Enter exactly one assignment

SAP Error Message - Details

• Message type: E = Error

• Message class: RD - CO-PA Connection to SAP BW

• Message number: 306

• Message text: Enter exactly one assignment

What causes this issue?

A transfer field can only have exactly one assignment.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Delete any entries that are not required or make the desired
assignment.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RD306 - Enter exactly one assignment ?

  The SAP error message RD306 ("Enter exactly one assignment") typically occurs in the context of SAP's Resource Management or Project System modules when a user is trying to assign resources or tasks but has not provided the required input correctly. This error indicates that the system expects exactly one assignment to be made, but either none or multiple assignments have been specified.
  Cause:
  
  No Assignment Made: The user may have attempted to save or process a transaction without making any assignment.
  Multiple Assignments: The user may have inadvertently selected multiple assignments when the system requires only one.
  Incorrect Input: The input fields may not have been filled out correctly, leading the system to interpret the input as invalid.
  
  Solution:
  
  Check Assignments: Ensure that you have made exactly one assignment. If you intended to assign a resource or task, make sure to select only one.
  Review Input Fields: Go through the input fields to ensure that all required fields are filled out correctly and that there are no extraneous selections.
  Clear Unnecessary Selections: If you have multiple selections, clear the unnecessary ones and ensure that only one assignment is selected.
  Consult Documentation: If you are unsure about the required fields or the process, refer to the relevant SAP documentation or user guides for guidance on how to make assignments correctly.
  
  Related Information:
  
  Transaction Codes: The error may occur in various transaction codes related to resource management, such as CJ20N (Project Builder) or CJR2 (Change Project).
  User Roles: Ensure that you have the appropriate permissions to make assignments in the system.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Support: If the issue persists, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  By following these steps, you should be able to resolve the RD306 error and proceed with your task in SAP.