How To Fix UCS0402 - Task &1: Technical predecessor &2 is not an explicit predecessor

SAP Error Message - Details

• Message type: E = Error

• Message class: UCS0 - Messages for Status Management

• Message number: 402

• Message text: Task &1: Technical predecessor &2 is not an explicit predecessor

What causes this issue?

Technical preceding task relationships between the relevant tasks result
from the Customizing settings of <LS>reclassification</> and <LS>
allocation</> methods.
Example: Task A uses method M and task B uses method N. The target
assignment of method M also occurs in the trigger for method N. As a
result, task A is a technical predecessor of task B.
The function <LS>Check Preceding Task Relationships</> determines the
technical preceding task relationships for <LS>reclassification</> and
<LS>allocation</> tasks and checks the technical preceding task
relationships for consistency against the settings for the explicit
preceding task relationships that you specified in the process view of
the consolidation workbench under the "Consolidation Monitor ->
Preceding Task Relationships" node.
The system has determined that task &V2& is a technical predecessor of
task &V1&. However, you have <ZH>not</> specified that task &V2& is an
explicit predecessor of task &V1&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check the settings for the preceding task relationships and, if
necessary, add task &V2& to the definition of the preceding tasks for
task &V1&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UCS0402 - Task &1: Technical predecessor &2 is not an explicit predecessor ?

  The SAP error message UCS0402 indicates that there is an issue with the task dependencies in a project or a network. Specifically, the message states that a technical predecessor (task) is not recognized as an explicit predecessor for the task in question. This can occur in project management scenarios, such as when using SAP Project System (PS) or SAP Advanced Planner and Optimizer (APO).
  Cause:
  The error typically arises due to one of the following reasons:
  
  Incorrect Task Relationships: The task you are trying to process has a predecessor that is not defined as an explicit predecessor in the system. This could be due to incorrect configuration or data entry.
  Missing Predecessor Definition: The predecessor task may not be properly defined in the project or network structure.
  Data Integrity Issues: There may be inconsistencies in the data, such as missing links or incorrect task IDs.
  System Configuration: The system may not be configured to recognize certain types of relationships or dependencies.
  
  Solution:
  To resolve the UCS0402 error, you can take the following steps:
  
  
  Check Task Relationships:
  
  Go to the project or network structure and verify the relationships between tasks.
  Ensure that the predecessor task is correctly defined and is an explicit predecessor of the task in question.
  
  
  
  Define Missing Predecessors:
  
  If the predecessor task is missing, you may need to create it or define it properly in the project structure.
  
  
  
  Review Task IDs:
  
  Ensure that the task IDs used in the relationships are correct and correspond to existing tasks in the system.
  
  
  
  Adjust Configuration:
  
  If necessary, review the configuration settings related to task dependencies in your SAP system to ensure they are set up correctly.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidance on managing task dependencies and resolving related errors.
  
  
  
  Testing:
  
  After making changes, test the project or network to ensure that the error is resolved and that the tasks are functioning as expected.
  
  
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like CJ20N (Project Builder) or CNO1 (Network) to view and edit project or network structures.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  User Forums: Consider visiting SAP community forums or user groups for insights from other users who may have encountered similar issues.
  
  If the problem persists after following these steps, it may be beneficial to consult with your SAP support team or a technical consultant for further assistance.