How To Fix RU228 - Start date cannot be determined (calendar &)

RU228 - Overview

• Message type: E = Error

• Message class: RU - Messages for order completion confirmation

• Message number: 228

• Message text: Start date cannot be determined (calendar &)

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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RU228 - Details

• The SAP error message RU228, which states "Start date cannot be determined (calendar &)," typically occurs in the context of scheduling or planning activities within SAP, particularly in modules like SAP Project System (PS) or SAP Production Planning (PP). This error indicates that the system is unable to determine a valid start date for a task or activity due to issues with the calendar settings or the configuration of the scheduling parameters.
  Causes:
  
  Missing or Incorrect Calendar Assignment: The calendar that is supposed to be used for scheduling may not be assigned to the project, task, or resource correctly.
  Invalid Calendar Settings: The calendar itself may have incorrect settings, such as non-working days or holidays that are not configured properly.
  Task Dependencies: If there are dependencies between tasks, and the predecessor task does not have a valid end date, the system may not be able to calculate the start date for the subsequent task.
  Resource