Message type: E = Error
Message class:  FI - TR-FM Funds Management 
Message number: 304
Message text: Cash Budget Management has already been deactivated in company code &
The company code has already been deactivated.
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.
The SAP error message FI304 indicates that Cash Budget Management (CBM) has already been deactivated for the specified company code. This error typically arises when there is an attempt to perform an operation related to Cash Budget Management in a company code where this functionality has been turned off.
Cause: Deactivation of Cash Budget Management: The primary cause of this error is that Cash Budget Management has been deactivated for the specified company code. This could have been done intentionally by a user with the necessary authorizations or as part of a system configuration change. Configuration Changes: Changes in the configuration settings related to financial management or cash management could lead to this error if the settings are not aligned with the operations being performed.
Solution: Check Configuration: Go to the configuration settings in SAP and verify if Cash Budget Management is indeed deactivated for the company code in question. This can typically be found
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