Should you wish to refuse a work order, tap the "Refuse" button from the actions menu whilst on the work order details page.

If you wish to add a reference, tap the textbox labelled as "Reference". This is a free form textbox and therefore you can put whatever you should see fit into this box.

 

If you should wish to add notes as to why the work order has been refused, tap the textbox labelled as "Notes", this is a free form textbox and therefore you can put whatever you should see fit into this box.

 

Should you wish to leave this page without refusing the work order, simply tap the "Back" button in the top left hand corner of the screen. This shall return you to the work orders detail page.