Is it possible to generate external HU numbers (alphanumeric) in COP21 in an HUM-IM storage location?

HI Sap community,According to this note 2573915 - Waiting WT not cancelled if LOSC WT confirmed with CHBD, we should use BAdI /SCWM/EX_CORE_CO_POST to trigger the WT cancellation for those HU-WTs that are not needed anymore. However, this BAdI is not...