How To Fix J3401 - In accordance with working day rule, a calendar is required

J3401 - Overview

• Message type: E = Error

• Message class: J3 - Dialog Messages for Data Pool Entry Transactions

• Message number: 401

• Message text: In accordance with working day rule, a calendar is required

What causes this issue?

An error occurred while checking a condition item for interest. A
calendar rule was selected for either the interest period end or for
the due date. One or the other calendar has to be maintained.

System Response

The data record can not be transferred.

How to fix this error?

Maintain the relevant calendar in your sender record and retransfer the
data.

Error message extract from SAP system. Copyright SAP SE.

J3401 - Details

• The SAP error message J3401, which states "In accordance with working day rule, a calendar is required," typically occurs in the context of project management or production planning when the system requires a calendar to determine working days for scheduling purposes. This error can arise in various scenarios, such as when creating or modifying a project, task, or production order.
  
  Cause:
  
  Missing Calendar Assignment: The most common cause of this error is that the relevant project, task, or order does not have a calendar assigned to it. SAP needs a calendar to understand which days are considered working days and which are not.
  Incorrect Configuration: The calendar settings in the system may not be configured correctly, leading to the inability to determine working days.
  Project Definition Issues: If the project definition does not include a valid calendar, this error can occur.
  
  
  Solution:
  To resolve the J3401 error, you can take the following steps:
  
  
  Assign a Calendar:
  
  Navigate to