How To Fix CY018 - Error when determining the calendar week

CY018 - Overview

• Message type: E = Error

• Message class: CY - Capacity Requirements Planning

• Message number: 018

• Message text: Error when determining the calendar week

What causes this issue?

When the system attempted to convert a date to a calendar week, an error
occurred. The date must be between 01/01/92 and 12/31/2098.

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

System Response

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CY018 - Error when determining the calendar week ?

  The SAP error message CY018 indicates an issue with determining the calendar week for a given date. This error typically arises in the context of planning and scheduling functions within SAP, particularly in modules like SAP PP (Production Planning) or SAP APO (Advanced Planning and Optimization).
  Cause of CY018 Error
  The error can be caused by several factors, including:
  
  Incorrect Date Format: The date provided may not be in the expected format or may be invalid.
  Missing Calendar Settings: The calendar settings in the system may not be properly configured. This includes the fiscal calendar or factory calendar settings.
  Date Outside Valid Range: The date being processed may fall outside the range defined in the calendar settings.
  Custom Code Issues: If there are custom developments or enhancements in the system, they may interfere with the standard date calculations.
  Time Zone Issues: If the system is set up with different time zones, it may lead to discrepancies in