Inconsistent RIB rules found

What causes this issue?

An RIB rule has been found for the combination &V1& of <DS>
<DS:DE.BURB_RBBLDNR>RIB ledger</></>, fiscal year, year of cash
effectivity and grant. This rule is based on the revenue cover group
&V2&.
However, there is also an RIB rule based on an RIB object (&V3&&V4&)
corresponding to the RIB source address of the revenue cover group &V2&,
but which was created for another year of cash effectivity.
This is not consistent: for different years of cash effectivity, both
RIB rules must be based on either the revenue cover group &V2&, or an
RIB object (such as &V3&&V4&) that corresponds to the RIB source address
of the revenue cover group &V2&.

System Response

If one of the RIB rules is a new rule to be created, the system stops
the creation of this new rule.

How to fix this error?

Decide whether both RIB rules should be based on the revenue cover group
&V2& or on an RIB object.
If applicable, delete the unwanted RIB rule or delete the revenue cover
group &V2&.
Try to create the desired RIB rule again.

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.