Question : Force TransferSpreadsheet to fail on key violation

Right now when I import a spreadsheet using the TransferSpreadsheet function a pop up will appear asking me if I wish to continue in the case of key violations. I do not want to give the user the option of continuing. How can I just show an error message instead of having the prompt appear?

I have tried trapping the error, but this doesn't seem to throw an error unless you choose no on the prompt.

Answer : Force TransferSpreadsheet to fail on key violation

AFAIK you can't ... if you need finer control, you should automate the import (i.e. automate Excel) and examine the data before you import.