Credit Note

SUGGESTED

When entering an ROA the first time, it was posted as 'pay later', when I went back to adjust it to  a check like it originally was, it says " cannot be adjusted as payments has been made already" or something like that. 

I looked up what to do and it mentioned somewhere to reversed the whole transaction to enter is as a sale invoice but doing that created a credit note on that vendor now. Can I reverse credit note?

Now, my whole cash Gen Ledger is out by that amount after a deposit. 

How to fix?