Can we call a!startprocess or any other smart service function from within any interface component saveinto apart from button saveinto.
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Yes, smart services can be executed in any save into of any component. You can execute only one smart service.
If the use case is not so critical, I suggest to call the smart service in the button or link. Because it is a costly computation which may slow down the interface performance if used in save into of some components like text field.
Yes you can. Can you elaborate your use case a bit? It might be that there are other, or even better options.