The Source Of Bill Messages

When a bill is completed, the system sweeps bill messages from the following sources onto the bill.

Note:

Bill or Bill Segment Messages. Bill messages will be linked either to the bill or to one of its bill segments depending on the source of the bill message code. In other words, messages associated with an obligation (directly or indirectly) will be linked to the bill segment; messages associated with an account (directly or indirectly) will be linked to the bill.

All permanent and temporary bill messages linked to an account are linked to the bill when it is completed. Refer to Account - Bill Messages for more information. Note well that all temporary bill messages are removed from the account when they are swept onto a bill (a temporary message is swept onto the next bill produced for the account).
The system checks if the bill's account's account type has bill messages. If so, it links all such messages that are effective on the bill date to the bill when it is completed. Refer to Setting Up Account Type Bill Messages.
All permanent and temporary bill messages linked to obligations that contributed bill segments to the bill are linked to their respective bill segment when the bill is completed. Refer to Obligation - Miscellaneous for more information. Note well that all temporary bill messages are removed from the obligation when they are swept onto a bill segment (a temporary message is swept onto the next bill segment produced for the obligation).
The system checks if each bill segment's rate has bill messages. If so, it links all such messages that are effective on the bill segment's start date to the bill segment when the bill is completed. Refer to Rate Schedule - Bill Messages.

In addition, a user may manually add an ad hoc message to a bill.

And finally, you can develop your own background processes and algorithms that add bill messages to accounts, obligations, bills and/or bill segments. Refer to Substituting Field Values Into A Bill Message for examples.