Recruiting test about ERROR_FILE_EXISTS and warnings after chart editing

Sometimes a little exclamation mark appears next to texts in labels, sometimes it doesn't. This is very annoying. Can you let me know how to turn that feature off? You will see two charts. On the left, you see the chart as it looks right after being inserted by the customer. This chart does not show any exclamation marks or warnings. On the right side, you see the chart after the customer edited it. As you can see, sometimes warnings are added and sometimes they are not, even though the label text was edited. Can you provide your colleagues with an explanation for this behavior? Again, please provide us with a clearly structured account of the problem. Please try to infer from the attached example at least a total of three of the rules you should use to decide when to add/not to add a warning. Please provide your colleagues with a clearly structured presentation of these rules (as a text, as a table, etc.). Please note that this presentation will be sent to the customer and should immediately make them understand the rules, so make sure to explain them very precisely. Can you think of any arguments as to why it would be advisable to have/not to have this feature? Chart after insertion Chart after editing Placeholder 5.5 Text 5.0 5.5 5.0 4.5 4.5 2.10 4.0 4.0 3.5 3.5 3.0 3.0 2.5 2.5 124 Second Level 2.0 1.5 Series 2.0 1.5 1.0 1.0 0.5 0.5 0.0 2016.2! 2016.0 2016.5 2017.0 2017.5 2018.0 2016.5 2017.0 2017.5 2018.0