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 (or if applicable,
fiscal year and 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 combined with another grant value.
This is not consistent: for different grant values, 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.