For CoCode &1 the leading ledger &2 cannot be assigned to CO version &3

What causes this issue?

The system wants to assign CO version &V2& to leading ledger &V1& for
all company codes.

System Response

This assignment is not possible for company code &V1& because the
prerequisites are not met. Most likely, the fiscal year variants between
a company code and its assigned controlling area are not identical.

How to fix this error?

Check the fiscal year variants in the master data of the company code
and assigned controlling area &V4& and make sure they are identical.

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.