Sorry, budget classification code "&1" does not exist in customizing

What causes this issue?

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

System Response

How to fix this error?

Check your Budget Classification codes in the
<DS:SIMG.J_3RF_BCCV>Maintain Budget Classification Codes</> Customizing
activity.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.