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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Can you explain your use case for executing 2 smart services at the same time? There may be other work-arounds depending on what you are trying to accomplish. For example, if you are trying to write to two different database tables, you can use the a!writeToMultipleDataStoreEntities() instead of a!writeToDataStoreEntity().
You could just start a process in your saveInto() within which you can execute > 1 Smart Service...but it does depend entirely on exactly what you're trying to achieve, as Peter Lewis is asking...