Unable to Cancel Subscription item from Sales Order

Summary:

When trying to Cancel the Subscription Item (whose Subscription Contract is created in OSM) from Order Management.Cancellation is done by creating Referenced Return SO with Return type as Cancel the Item & Credit method as Prorate with Credit, upon Submitting Return Order we are facing an Algorithm error as shown in below screen shot.
Subscription item as Rate plan pricing defined with Sale Price, recurring charges & Usage charges in it.

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