Method: DELETE_MODELS
Method: SET_CATEGORIES
Method: GET_CATEGORIES
Method: CHECK_CATEG_IN
Method: DETERMINE_SYSRELS_TRANSPORT
Method: IMPORT_CATEGORIES
Method: IMPORT_SW_COMP
Method: WHERE_USED_SYSREL
Method: GET_SYSREL_TIMESTAMP
Method: CHECK_SYSREL_INT
Method: CHECK_SYSREL_DEL