Sending a Async WPS request:
<wps:ResponseDocument storeExecuteResponse="true" status="true" lineage="false">
The server will reply with the correct status response (ProcessAccepted). In case the request has some error (for example an incorrect interpolation method) this ProcessesAccepted has to be replaced by and WPSErrorException. This doesn't happen.
In case of a sync call the error is reported immediately.