Why isn't there braking unit available for ATV930C22N4C?

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Braking unit availability for ATV930C22N4C AltivarProcess variable speed drives

There is no option-braking unit (BU) available for ATV930C22N4C.

Braking units are available for C11N4C, C13N4C, C16N4C, C25N4C, C31N4C, but not for C22N4C. For 220kW drive, we offer ATV930C22N4 that has built-in braking transistor, so BU is not needed for this size.
If braking is needed for 220kW drive, correct reference for purchase is ATV930C22N4.
If ATV930C22N4C is bought there is no option to add braking unit or resistor.