QuickBooks OLSU 1013 takes place when QuickBooks fails to communicate with your bank or financial institution. It can occur when you have authorized an inactive bank account for online banking in QuickBooks. Improper setting of online banking in QuickBooks can also promote error OLSU. When the error occurs, you may not be able to update your account information or download the latest transactions from your bank. For effective troubleshooting of the banking error code OLSU 1013 in QuickBooks.