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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The documentation says:
"NOTE: While you can use any number of saves, only one smart service can be executed in an interface saveInto parameter"
saveInto
(see: https://docs.appian.com/suite/help/19.3/executing_smart_services.html)