Delta Plugin - Sales orders not going to Delta. Error - 'Request not yet received at warehouse'

The order will have a status of Sent - not yet received at Warehouse as soon as the CSV file is placed in the folder. A separate process monitors this folder for any new files that have arrived in the folder and when it sees a new file has arrived in the folder it will pick up the file to process it.
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The monitoring process will be set to cycle at different times depending upon how it was set up in the first place.
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If for example it is set to run every 10 minutes then your sales order will have a status of Sent - not yet received at Warehouse for a maximum of 10 minutes.
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As soon as the CSV file has been picked up by the process and loaded into Delta then the status of the order will change to Outstanding - not yet picked.
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It may be an issue with part of a case being entered instead of the single units for quantity that is preventing it being processed.