Cancelling Workiten after creating new one for WF Process with same Object

Greetings Friends,

Imagine this scenario:

My SD user creates a new Salesdocument at VA01. And that starts my Workflow, blocking the order, requesting for several aproavals before releasing the "Delivery Block" for the order.

An Hour later, the same or another user changes this Salesdocument at VA02 starting again my Workflow, (WF definintion has "Created" and "Changed" Method as Triggering events).

Now, my Aprover SBWP has two Workitens (Decision). Those two is "Salesorder Blocked".

My question is: There is a simple way to cancel an Workitem about the same order when

the Workflow starts for the same "Object-Istance"? Or I going to need to create a Task

to manually delete the first Workitem everytime my Workflow starts?

Att,

José Oliveira.