Interface Definition: Expression evaluation error [evaluation ID = XVWQ7PGA] : An error occurred while executing a save: Expression evaluation error : Attempted to run a second smart service, but only one smart service can be run per expression evaluation.
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We can execute only one smart service in saveInto parameter.
you can try like this , for suppose if you have two process model process model 1 and process model 2 you need to start this process models at same time when you clicks on button or link ,then create a parent process model in that parent process model you can start process model 1 and process model 2.
so in saveInto parameter execute smart service to start parent process model.