Financial transaction '30' in commitment item but account not classified

What causes this issue?

The US Federal extension of the Budgetary Ledger (BL) is active. You are
posting to an SGL account not classified as "delivered" containing a
commitment item with financial transaction '30' (for posting revenue,
expenditure, asset, inventory stocks...).
This customizing might be an error except for down payments.
In this case, you are posting to account &V1& with commitment item &V2&
and financial transaction &V3& in company code &V4&.

System Response

If you continue to post this transaction, the BL might create incorrect
postings to BL accounts not expected.

How to fix this error?

If this is an error, classify the account as "delivered" in the
customizing for the US Federal extension of the BL.
This is a customizable message with default severity as "Warning". You
can change it to "Error", or even ignore it according to your needs.
If necessary, change the message control in the IMG for application area
FMFG_BLEXT, with message number 018.
Remember that, if this error is displayed during the run of a report
instead of a dialog, some events, such as END-OF-SELECTION, change the
severity of the message from warning to error regardless of
customizing.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.