Payment cannot be deleted

Hi

A staff member created an invoice for a cash sale, however I think the payment was made directly to the Cash Drawer instead of ticking the Undeposited Funds box, I cannot be certain about this.

The funds were sitting in the Cash Drawer Bank Account.

I thought I would just do a general journal to move from the cash drawer bank account to our working account, however this created a negative figure in the Prepare Bank Deposit. I have since deleted this journal.

I tried to delete the payment against the invoice, however the option to do this is not available to me. I am an Administrator with full authority to do everything and the check box is unticked under security which allows for deletion. As I could not delete the payment, I reversed the payment.

Now the reversal is sitting as a negative figure in the Prepare Bank Deposit. The Cash Drawer account shows both a debit (the initial payment) and a credit (the reversal), however there is still the negative amount showing as the current balance of this account.

I then tried to delete the now unpaid invoice and receive an error message that a sale with payments applied may not be deleted.

Why can't I just delete the payment and why did the journal and the payment reversal create a figure in the prepare bank deposit

I just need the payment deleted, so I can start again. How can I fix this

Thanks