Thank you for the answer and quick reply.  

However, our company, like a plethora of others, do not always create Sales Orders.

For ALL Direct Fulfillment orders, we only create an Invoice to relieve inventory. No SO is needed or created, as this is extra time, money and resources to create paperwork that is not required to process the order.  That said, a Packing List is required by Amazon, Lowe's, Home Depot.. et. all...

Additionally, double saving the Invoice is also a time consuming effort, we prefer to skip.