Setup user as a worker to access Purchase Order form.

Following is the common note shown by application while normal user trying to access Purchase Orders form.
"You are not setup as a worker. To access this form you need to be a worker."

Follow below steps to setup user as worker/buyer.

1. Navigate to Human Resources->People->Enter and Maintain
   Provide all mandatory details in People form.
   Select Person Types as Employee(Use Action lov to get this)
   Save the changes.   

2. Navigate to Purchasing->Setup->Personnel->Buyers
   This opens Buyers OA page.
   Click on Add Buyer button and add the person created in last step as a Buyer.
   Save Changes.

 3.Navigate to System Administrator->Security->User->Define
  It opens Users form.
  Query your preferred user details.

  Add person created in the previous steps to this user.
  Save Changes.

4.Navigate back to Purchasing->Purchase Orders->Purchase Orders
  Now application allow you to see Purchase Order form with out any notes.