How To Fix CN820 - No work center assigned to predecessor

CN820 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 820

• Message text: No work center assigned to predecessor

What causes this issue?

You want to calculate the time interval of the relationship as a
percentage of the duration of the predecessor. But no work center has
been entered for this activity and therefore no calendar is available
to perform this calculation.

System Response

The function is carried out. If you have not entered a work center for
the predecessor, the system uses the factory calendar to calculate the
time interval that you have maintained in the network header or the
header of the standard network.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN820 - No work center assigned to predecessor ?

  The SAP error message CN820 ("No work center assigned to predecessor") typically occurs in the context of project management and production planning when there is an issue with the assignment of work centers in a network or activity within a project. This error indicates that the predecessor activity does not have a work center assigned, which is necessary for scheduling and resource allocation.
  
  Cause:
  
  Missing Work Center Assignment: The predecessor activity in the project network does not have a work center assigned to it. This can happen if the activity was created without specifying a work center or if the work center was deleted or not properly configured.
  Incorrect Configuration: The work center may not be correctly set up in the system, or it may not be valid for the type of activity being processed.
  Data Inconsistencies: There may be inconsistencies in the data related to the project or network, such as missing or