Hi Daniel,
authorizations are checked as well, maybe you have no authorization for SMIN?
Anyways, you can check the following method:
cl_crm_uiu_bt_get_proctypes=>get_proc_types
Eventually you will come to these funciton modules:
RM_BSP_SALES_GET_PROC_TYPE
CRM_PROCTYP_FROM_OBJTYP_SEL_CB
There the seleciton is done.
On first glance they are filtered by business object BUS2000223, inactive flag and authorizations.
Best Regards,
Christoph