Posting for reversal document &1 year &2 first takes place with new bdoc.

What causes this issue?

The system does not repost the payment for the selected reversal
document to the new title until the new billing document has been
billed.

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?

If the payment with title information is to be cleared immediately and a
posting without title information is to be made, you should delete the
indicator <LS>Reposting First With New Billing Document</> on the
selection screen.

Error message extract from SAP system. Copyright SAP SE.