Patch 10.0.7 has brought a significant change to the Public Work Order system. Players who are placing Public Orders no longer have to supply all reagents.
Public Crafting Order ChangeIn Patch 10.0.7, players are no longer required to supply all reagents for their craft when placing Public Orders. Despite this change, players are still required to supply BoP materials like Primal Chaos and Spark of Ingenuity. An exception to this rule is Artisan's Mettle.Placing a Public Work Order without Supplying any Reagents
Crafters Be Careful!Because of this change, many crafters are accepting orders and accidentally spending their own materials without realizing. To combat this, Blizzard has added an alert box that pops up whenever you are about to use your own materials. If you accept an order that you thought had reagents, but it doesn't, that is okay! Once you accept an order, you have the ability to cancel without any consequences. Alert Box that shows up whenever you are about to complete a Work Order with your own materialsFull Work Order Menu with Alert Box, and «Cancel Order» button in Bottom Corner To anyone placing Public Orders, you will want to be mindful of your commission. If you are not providing reagents, you will want to make sure that your commission covers the cost of those items, or your order may be ignored.
Read more on wowhead.com