How To Fix CN773 - Restriction: finish date occurs before start date

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 773

• Message text: Restriction: finish date occurs before start date

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CN773 - Restriction: finish date occurs before start date ?

  The SAP error message CN773, which states "Restriction: finish date occurs before start date," typically occurs in the context of project management or scheduling within SAP, particularly in the Project System (PS) module. This error indicates that there is a conflict in the dates assigned to a task or activity, where the finish date is set earlier than the start date, which is logically incorrect.
  Cause:
  
  Incorrect Date Entry: The most common cause is that the user has mistakenly entered the finish date as being earlier than the start date.
  Data Migration Issues: If data has been migrated from another system, there may be inconsistencies in the date entries.
  Changes in Scheduling: If there have been changes to the project schedule, such as rescheduling tasks, it may lead to this error if the dates are not updated correctly.
  Dependencies and Constraints: If there are dependencies or constraints set on the task that conflict with the entered dates, this error may arise.
  
  Solution:
  
  Check Date Entries: Review the start and finish dates for the task or activity in question. Ensure that the finish date is later than the start date.
  Adjust Dates: If the finish date is indeed earlier than the start date, correct it by entering a valid finish date that is after the start date.
  Review Dependencies: Check for any dependencies or constraints that may affect the scheduling of the task. Adjust them if necessary.
  Data Validation: If the error arises from data migration, validate the data entries to ensure that all dates are correctly formatted and logical.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on date entry and project scheduling.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like CJ20N (Project Builder) or CJ02 (Change Project) to access and modify project data.
  User Authorizations: Ensure that you have the necessary authorizations to make changes to project data.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance related to this error.
  Testing: After making changes, test the scheduling to ensure that the error does not reoccur and that the project timeline is accurate.
  
  By following these steps, you should be able to resolve the CN773 error and ensure that your project scheduling is accurate and logical.