The best replacement for sales order is purchase order.

The best alternatives to sales order are rated as following:
★★★★★  purchase order
★★★★  invoice
★★  work order
★★  invoice quickbooks
★  sales receipt
★  sales invoice
★  delivery order
★  production order
  quotation
  sales receipt quickbooks
  customer order

Your alternative for sales order is not listed? Suggest!
Speaking about sales order, one probably shouldn't forget about delivery sap.

Other search terms related to sales order and their ratings are:
★★★★★ delivery sap
★★★ billing
★★★ delivery
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Google Trends

Scale is based on the average worldwide traffic of sales order in all years. Click on graph for more.
sales order
purchase order
invoice