I believe it is as follows:

TYPE “0”: A GENERIC ASYNC ENTRY
TYPE “1”: ASYNC ENTRY REPRESENTS AN ACTIVITY LEVEL ESCALATION
TYPE “2”: ASYNC ENTRY REPRESENTS AN ACTIVITY LEVEL START RULE, THE PROCESS INSTANCE WILL BE IN STATUS “ACTIVE”
TYPE “3”: ASYNC ENTRY RESPRESENTS AN SLEEPING WORKLISTITEM WHICH WILL BE WOKEN AT THE SPECIFIED DATE AND TIME
TYPE “4”: ASYNC ENTRY RESPRESENTS A K2 ROLE USED IN AN ACTIVITY DESTINATION RULE WHICH IS FLAGGED AS DYNAMIC / KEEP IN SYNC
TYPE “5”: ASYNC ENTRY REPRESENTS AN PROCESS LEVEL ESCALATION
TYPE “6”: ASYNC ENTRY REPRESENTS AN EVENT LEVEL ESCALATION
TYPE “7”: ASYNC ENTRY REPRESENTS A WORKLISTSHARE WHICH WILL SHARE / UNSHARE AT THE SPECIFIED DATE AND TIME
TYPE “8”: ASYNC ENTRY REPRESENTS PROCESS RIGHTS
TYPE “9”: ASYNC ENTRY REPRESENTS IN-MEMORY PROCESS INSTANCE “STATE” WHICH NEEDS TO BE COMMITTED TO THE DATABASE