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We have 4 query database smart service nodes in the process model which we are triggering through interface using a!startProcess() based on selected action like add,update and move but business want us to show real time error in the interface if any node fails or process fails, how can we achieve this?
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Did you consider using related record actions instead of startProcess?
If you are after a specific node failures , then your design should be very intensive and after every node you need to make DB entry for success/ failures- messages... and you can call it from interface using refresh function. But Stefan Helzle's suggestion is very valid.