How To Fix CN449 - Billing block not automatically set in billing plan dates

CN449 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 449

• Message text: Billing block not automatically set in billing plan dates

What causes this issue?

You have deleted an actual date from the milestone. This milestone
could be used to determine the date in a billing plan. The system does
not automatically set the billing block for dates in the billing plan
Note
When you use a milestone for a billing plan, the system locks billing
until you enter an actual date for the milestone. The system
automatically unlocks billing when you enter an actual date.
Deleting an actual date does not cause the system to relock billing.

Error message extract from SAP system. Copyright SAP SE.

CN449 - Details

• The SAP error message CN449, which states "Billing block not automatically set in billing plan dates," typically occurs in the context of project system (PS) or sales and distribution (SD) modules when there is an issue with the billing plan configuration or the conditions under which billing blocks are applied.
  
  Cause:
  
  Billing Plan Configuration: The billing plan may not be configured correctly. This includes settings related to billing types, billing frequency, or the specific conditions under which billing blocks should be applied.
  Project or Sales Order Status: The project or sales order may not be in a status that allows for billing. For example, if the project is still in the planning phase or if there are open issues that need to be resolved.
  Billing Block Settings: The billing block settings in the customer master or material master may not be set up correctly, leading to the system not applying the billing block as