| Oracle Workflow Developer's Guide Release 2.6.3 Part Number B10284-02  | 
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Following is a description of each activity in the subprocess, listed by the activity's display name.
This Standard function activity marks the start of the process.
| Function | WF_STANDARD.NOOP | 
| Result Type | None | 
| Prerequisite Activities | None | 
This event activity waits to receive the B2B Invoice event message from the supplier.
| Event Action | Receive | 
| Event Filter | demo.oracle.wf.b2b.po.invoice | 
| Prerequisite Activities | Start | 
| Item Attributes Set by Activity | Event Name, Event Key, Event Message | 
This activity notifies the order requestor that the invoice for the purchase order has been received from the supplier. The message includes a 'Send' attribute that displays the purchase order number when the notification is sent.
If you display the property page of this activity node, you see that the activity is assigned to a performer whose name is stored in the item type attribute named Order Requestor.
| Message | Supplier PO Invoice | 
| Result Type | None | 
| Prerequisite Activities | Buyer: Receive Supplier Invoice | 
This Standard function activity marks the end of the process.
| Function | WF_STANDARD.NOOP | 
| Result Type | None | 
| Prerequisite Activities | Invoice for Order Has Arrived | 
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