Symptoms
In PBA 5.5 a feature "Single Order Instead of Pair of Cancellation/Charge Orders" was introduced, in the Release Notes it is stated:
"The new order type called Cancellation (CF) replaces the pair of Cancellation Order (CL) and Cancellation Charge (CF). The new Cancellation Order can have both positive (in case of a cancellation) and negative (in case of a cancellation fee) amount."
However the new subscription cancellation orders are still named Cancellation Charges orders.
Cause
Already generated orders (before upgrade to PBA 5.5) are not renamed. On PBA 5.5.0 the cancellation orders are of type CF but called Cancellation Charges orders. Since PBA 5.5.1 the orders will be named Cancellation, if the name Cancellation Charges has not been customized before upgrade.
Note, if it will be required to get all the cancellation orders (created before and after upgrade to 5.5) by OrderByStatusListGet_API method, you will need to execute it twice - with OrderTypeID set to CL and to CF.