How To Fix TU201 - Function not possible - no changeable due dates exist

TU201 - Overview

• Message type: E = Error

• Message class: TU - Billing/Scheduling/Budget Billing

• Message number: 201

• Message text: Function not possible - no changeable due dates exist

What causes this issue?

The function you have chosen cannot be executed; after checking the
budget billing plan, the system established that no modifiable due
dates exist. Possible reasons for this are as follows:
Due dates have been transferred the installment plan
The due dates are in the past
No more open due amounts exist
Partially paid due amounts exist
All requests have already been printed
The budget billing plan has been deactivated

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?

Error message extract from SAP system. Copyright SAP SE.

TU201 - Details

• The SAP error message TU201 ("Function not possible - no changeable due dates exist") typically occurs in the context of transportation management or logistics when trying to perform an operation that requires changeable due dates, but none are available for the selected object (like a transportation order, delivery, etc.).
  
  Cause:
  
  
  No Changeable Due Dates: The primary reason for this error is that the system does not have any due dates that can be modified for the selected document. This can happen if:
  
  The due dates have already been finalized or locked.
  The document is in a status that does not allow changes.
  The due dates are set based on certain conditions that do not permit changes.
  
  
  
  Document Status: The status of the document may not allow for changes. For example, if the document is already confirmed or has been processed in a way that locks its due dates.
  
  
  
  Configuration Issues: There may be configuration settings in the