How To Fix CY344 - Network &/&: The start date is after the constraint date

SAP Error Message - Details

• Message type: E = Error

• Message class: CY - Capacity Requirements Planning

• Message number: 344

• Message text: Network &/&: The start date is after the constraint date

What causes this issue?

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

How to fix this error?

You should enter a date which is before the constraint date in the
network.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CY344 - Network &/&: The start date is after the constraint date ?

  The SAP error message CY344 ("Network &/&: The start date is after the constraint date") typically occurs in the context of project management and scheduling within SAP, particularly when working with networks in the Project System (PS) module or in Production Planning (PP). This error indicates that there is a scheduling conflict where the start date of a network activity is set to begin after a defined constraint date, which is not allowed.
  Cause:
  
  Constraint Date: The constraint date is a predefined date that limits when an activity can start or finish. If the start date of the activity is set to a date that is later than this constraint date, the system will trigger this error.
  Incorrect Scheduling: The scheduling of activities may have been done incorrectly, either manually or through automated scheduling processes.
  Dependencies: There may be dependencies or relationships between activities that have not been properly defined, leading to scheduling conflicts.
  Changes in Dates: If there have been recent changes to the project schedule or constraints, it may have resulted in this conflict.
  
  Solution:
  
  Check Constraint Dates: Review the constraint dates set for the network activity. Ensure that the start date of the activity is on or before the constraint date.
  Adjust Start Dates: If the start date is indeed after the constraint date, adjust the start date to be on or before the constraint date.
  Review Dependencies: Check the relationships and dependencies between activities in the network. Ensure that all predecessor and successor relationships are correctly defined.
  Re-schedule Activities: If necessary, re-schedule the activities in the network to resolve any conflicts.
  Consult Project Management Guidelines: Ensure that the scheduling adheres to the project management guidelines and constraints defined for the project.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like CN21 (Create Network), CN22 (Change Network), or CN41 (Display Network) to manage networks and check their details.
  Project System (PS) Module: Familiarize yourself with the functionalities of the PS module in SAP, as it provides tools for managing projects, including scheduling and resource allocation.
  Documentation: Refer to SAP documentation or help files for more detailed information on managing networks and understanding constraint dates.
  
  If the issue persists after checking the above points, it may be beneficial to consult with a SAP specialist or your organization's SAP support team for further assistance.