Copying not possible since the rules are different

What causes this issue?

The account assignment cannot be copied from one chart of accounts to
another, since although the rules for account determination are
available in both charts of accounts, they are also different.

System Response

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

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.