How To Fix CPWB127 - Validity window cannot be set as narrow as the key date

CPWB127 - Overview

• Message type: E = Error

• Message class: CPWB - General Workbench Messages

• Message number: 127

• Message text: Validity window cannot be set as narrow as the key date

What causes this issue?

You want to use a key date as the validity window instead of the
validity period of the change status of a superior object. To do this,
one of the following conditions must have been met:

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

You have entered a key date
You have entered a change number with date effectivity.
You have entered a change number with parameter effectivity and are
using a one-day selection period.
However, none of these conditions has been met.

System Response

The validity period of the change status of the superior object is
still being used as the validity window.

How to fix this error?

If you want to use the key date as the validity window, proceed as
follows:
Enter a key date or change number. Only enter a change number with
parameter effectivity if you are using a one-day selection period.
Choose <LS>Extras -> Options</>.
On the <ls>Validity Window</> tab page select the <ls>Key date</> radio
button.

Error message extract from SAP system. Copyright SAP SE.

CPWB127 - Details

• The SAP error message CPWB127, which states "Validity window cannot be set as narrow as the key date," typically occurs in the context of SAP's Capacity Planning or Production Planning modules. This error indicates that the validity period you are trying to set for a particular planning object (like a production order, capacity, or resource) is too restrictive compared to the key date you are working with.
  
  Cause:
  
  
  Key Date vs. Validity Window: The key date is the reference date for planning activities. If you attempt to set a validity window (the period during which a certain planning object is valid) that is narrower than the key date, SAP will throw this error. For example, if the key date is set to today, you cannot set a validity window that starts after today.
  
  
  Incorrect Date Settings: The dates you are entering for the validity window may not align with the key date. This