CallAppEngine Function

Use the CallAppEngine function only in events that allow database updates, because, generally, if you are calling Application Engine, you intend to perform database updates. This category of events includes the following PeopleCode events:

•SavePreChange (Page)

•SavePostChange (Page)

•Workflow

•FieldChange 

CallAppEngine cannot be used in a Application Engine PeopleCode action. If you need to access one Application Engine program from another Application Engine program, use the CallSection action.