Can not post invoice, getting POST ERRORS as the batch id

[SteveBoy2007]

The batch id on the sales transaction inquiry screen is POST ERRORS. So, we tried to re-post so we could see what the errors was. The error said that the cust had no tax schedule. So, we added the tax schedule to the cust. Now, when we try to repost, we get an error that says that the item was already posted.

How do we fix this error so we can report this invoice.

We received the payment from the cust, but we can't look up the invoice so we can apply payment to it.

Help.

Thanks.