The Data Sources Engine by default truncates the comma "," in the events column.
If a user intends to upload a revenue of $3.99 for an event but unintentionally uploads a value of "3,99", the system would accept the value without any errors. However the comma gets truncated, and the value reflects in the system would be "$399" instead of "$3.99".
To avoid the problem, period character "." is recommended instead of the comma character as shown above.