How To Fix CY346 - Network &/&: The finish date is before the constraint date

SAP Error Message - Details

• Message type: E = Error

• Message class: CY - Capacity Requirements Planning

• Message number: 346

• Message text: Network &/&: The finish date is before the constraint date

What causes this issue?

The finish date for the operation has the constraint that it should not
be before a particular date (constraint date). However the start date
when you want to dispatch the operation leads to a finish date which is
before the constraint date. Therefore it is not possible to
dispatch the operation.

How to fix this error?

You should change the start date so that the operation finishes before
the constraint date.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CY346 - Network &/&: The finish date is before the constraint date ?

  The SAP error message CY346 ("Network &/&: The finish date is before the constraint date") typically occurs in the context of project management and scheduling within SAP, particularly when working with networks and activities in the Project System (PS) module. This error indicates that there is a scheduling conflict where the finish date of a network activity is set to occur before a defined constraint date, which is not allowed.
  Cause:
  
  Constraint Date: A constraint date is a specific date that limits when an activity can start or finish. This could be a "Must Start On," "Must Finish On," or "Start No Earlier Than" constraint.
  Scheduling Logic: The scheduling logic in SAP is trying to calculate the finish date based on the defined constraints, but the current settings lead to a situation where the finish date is earlier than the constraint date.
  Incorrect Dates: The dates entered for the activity or the constraints may be incorrect or not aligned with the project timeline.
  Dependencies: There may be dependencies between activities that are not properly set, leading to scheduling conflicts.
  
  Solution:
  
  Check Activity Dates: Review the start and finish dates of the affected network activity. Ensure that the finish date is not set before the constraint date.
  Adjust Constraints: If the constraint date is too early, consider adjusting it to a later date that aligns with the project schedule.
  Review Dependencies: Check for any predecessor or successor relationships that might be affecting the scheduling of the activity. Ensure that all dependencies are correctly defined.
  Re-schedule the Network: If necessary, re-schedule the entire network to ensure that all activities are aligned with their constraints and dependencies.
  Consult Project Management Guidelines: Ensure that the project management guidelines and scheduling rules are being followed, as they may provide insights into how to resolve the conflict.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like CJ20N (Project Builder) or CN41 (Network Overview) to view and edit network activities and their constraints.
  SAP Notes: Check for any relevant SAP Notes or documentation that may provide additional insights or updates related to this error.
  User Authorization: Ensure that you have the necessary authorizations to make changes to the network activities and constraints.
  Testing Changes: After making adjustments, test the changes in a development or test environment before applying them to the production environment to avoid further issues.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.