Correcting Wrong Class Type and Balance Forward

Previous CPA transferred a contra-asset account as a accounts receivable amount with a balance forward of approx 16k.  I created an other current asset - as the contra asset is not an option and switched the balance forward from the accounts receivable account to the other asset.  When doing this it did not allow me to enter as a credit like it should be.  It did not fix the issue I had with the Allowance for Doubtful Accounts being a credit instead of a debit.  How do I correct this? The Allowance for Doubtful Accts essentially can be zeroed out as it has been on the books for years.