If error occurs after invoice/credit memo is sent to AvaTax, records will be sent multiple times

[erikhansen]

Issue explanation

If an invoice/credit memo is sent to AvaTax via the AvaTax Queue, but in the process of the queue being processed, an error occurs, the queued item will stay in a "processing" and will be sent to AvaTax multiple times. This results in a invoices or credit memos being recorded multiple times.

For example, if a credit memo is sent to AvaTax but then the process can't save the credit memo, and exception will be thrown and the queued item will stay as "processing".

Solution

If an exception occurs and the record has already been sent to AvaTax, immediately change the status to "failed" so that it will not be attempted to send again.

[erikhansen]

I've implemented a solution to fix this issue. Here is a screenshot demonstrating an example error message when a record fails after being sent to AvaTax: