3 answers
The best I've been able to do is present the user with a link that they can click on to take them to a specific URL.
Alternatively you can set the FinishLocation if you have your Flow running within a VF page, like this:
<apex:page >
<flow:interview name="Create_Procurement_Items" finishLocation="/{!$CurrentPage.parameters.ProcIDInput}">
<apex:param name="ProcIDInput" value="{!$CurrentPage.parameters.ProcIDInput}" />
</flow:interview>
</apex:page>