External reconciliation not balancing post upgrade to 88.2 PL11

Hi Experts

I have a problem with one of my clients, I have upgraded them from SAP Business One 2007 to SAP Business One 88.2 PL11.

Below is the problem currently at hand:

The accounts person does her external reconciliation every Friday morning, prior to the upgrade she reconciled with R 200 000.00( for argument sake). After upgrading SAP B1 to 88.2, when she is doing her external reconciliation, the last balance is not R 204 136.00. When drilling into the account, the amount as at the date she did her last reconciliation is R 200 000.00 not R 204 136.00.

I cannot find any posting in the system that references to the R 4 136.00 difference that I have.

Any ideas on how to get to the root cause of the issue.

Thank you in advance.

Regards,

Aubrey