Do you know if this checkbook was ever reconcile? If you go to Cards->Financial->Checkbook and pull up this checkbook can you enter values for Last Reconciled Balance and Last Reconciled Date. If you can, this checkbook has never been reconciled. It that case you can follow these steps, ignore the steps about marking the CB as inactive, the point is to pick a stop where you have manually reconciled you CB:
1. Post all transactions in Payables Management, Receivables Management, Sales Order Processing, Invoicing and Payroll.
2. Click Cards, click Financial, and then click Checkbook.
3. Select an existing Checkbook and then click to select the Inactive check box. Repeat this step to mark each existing Checkbook as inactive.
4. Manually reconcile your last bank statement and determine your outstanding checks and deposits.
5. Click Setup, click System, click Registration, enter your Registration Keys, and then click OK.
6. Click Cards, click Financial, click Checkbook, set up your checkbook with the appropriate settings, and enter your Last Reconciled Balance and Last Reconciled Date from the last bank statement reconciled manually.
7. Click Setup, click Posting, click Posting, select Financial as the Series, select Bank Transaction Entry as the Origin, click to de-select the Post to General Ledger check box, and then click Save. Repeat this step to de-select the Post to General Ledger check box for the Bank Deposit Entry window and then click OK to exit the window. This turns off posting to General Ledger.
8. Click Transactions, click Financial, click Bank Transactions, enter your outstanding checks, and then click Post. Repeat this step to enter and post all outstanding checks, click X to close the window, and then click OK to print the Bank Reconciliation Posting Journal.
9. Click Transactions, click Financial, click Bank Deposits, enter your outstanding deposits, and then click Post. Repeat this step to enter and post all outstanding deposits, click X to close the window, and then click OK to print the Bank Reconciliation Posting Journal.
10. Click Cards, click Financial, click Checkbook, and then compare the Checkbook Balance to the Cash Account Balance. The two balances must equal.
11. Click Setup, click Posting, click Posting, select Financial as the Series, select Bank Transaction Entry as the Origin, click to select the Post to General Ledger check box, and then click Save. Repeat this step to select the Post to General Ledger check box for the Bank Deposit Entry window and then click OK to exit the window. This turns on posting to General Ledger.
12. Verify that all Customers, Vendors and Employees are set up to Use Cash Account from Checkbook.