New answers tagged co-authoring
There won't be any errors but it will give you a message saying save conflicts do you want to update the changes and when you click yes then the user getting this message will see the updated list item that he was working on and the other user will see the updated list item that he was working on. As the simultaneous save is practically not fully ...
I am assumind that you are reffering to user own information by "rows". As long as you dont have users that are editing the same row at the same time that in doesnt matter. Your performance will be a bit degraded depending on how your physical architecture is set up but other than that you shouldnt get any errors.
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