since they are posted to accounting already, you can filter the invoices that got created on 29th July & have them not considered for reconcilation outside the SAP system, this is the easiest option.
or check with your FI team on doing manual postings/ adjustments in the relevant periods.
even if we do a change at the table level on VBRK( considering you have the relevant authorization) which is the worst case, you will still not see the impact at the reconcilation level.
so Only manual options are available. sorry.
Regards
Ilango