How To Fix PSSC_NET031 - The successor NCD for NCD &1 is not unique (internal error)

PSSC_NET031 - Overview

• Message type: E = Error

• Message class: PSSC_NET - Net Calculation

• Message number: 031

• Message text: The successor NCD for NCD &1 is not unique (internal error)

What causes this issue?

Net calculation failed to determine the sucessor net calculation
document, because more than one net calculation header has been
determined.

System Response

Net calculation processing is not carried for the current net
calculation unit period.

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

There should be only one net calculation document header (table
PSSCD_NET) for each settlement period, with either of the following
statuses:
"Open" (technical key 01)
"Billed" (technical key 02)
The problem occured for Net Calculation Document &V1&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message PSSC_NET031 - The successor NCD for NCD &1 is not unique (internal error) ?

  The SAP error message PSSC_NET031 indicates that there is an issue with the successor NCD (Network Component Definition) for a given NCD, where the system has found that the successor is not unique. This typically occurs in the context of project management or network planning within SAP, particularly in the Project System (PS) or similar modules.
  
  Cause:
  
  Duplicate Successors: The error usually arises when there are multiple successor NCDs defined for a single predecessor NCD, which violates the uniqueness requirement for successors in the network structure.
  Data Integrity Issues: There may be inconsistencies or corruption in the data related to the network components, leading to the system being unable to determine a unique successor.
  Configuration Errors: Incorrect configuration settings in the project or network planning module can also lead to this error.
  
  
  Solution:
  
  
  Check Successor Definitions:
  
  Navigate to the relevant transaction (e.g., CN21 for network activities) and check the successor definitions for the specified NCD.
  Ensure that there