Purchase orders are optional. If Purchase Orders are not entered, Goods Receipt POs can be keyed in directly when the goods arrive. Purchase Orders can be keyed into the production system at any time since they do not create a financial impact and will not affect the trial balance.
If Valogix is installed Purchase Orders should be entered so that Valogix recognizes the orders and does not recommend that the re-order any inventory based off of commitments and replenishment levels.
Sales Quotations and Sales Orders
Sales Quotes/Orders are optional but highly recommended. Like Purchase Orders these documents do not create a financial impact.
Depending on how SAP has been customized to suit business requirements these documents may become mandatory.