As per my understanding from whatever little info has been provided is that you want to have the reversal of sales for an order which was already partially delivered.
Please note that this cycle will be same as the normal return cycle ( or a Credit memo Request -> credit memo cycle if no goods are expected to be returned).
The Sales order being partially delivered is not going to affect the return cycle as the return cycle will be with reference to the sales invoice and not the initial order.
<Text removed by Moderator. Reason: Points begging.> as JP and Jagan pointed, please elaborate on the issue.
-Cheers,
Sachin.
Message was edited by: Jyoti Prakash