Help for 'Data Check'
Generally, the data checking looks to see if your data are consistent with each other and if you have overlooked a step in the loading process.
Errors of many different types are checked. One row will appear for each error that is found. If a certain type of error is not found, the row for that error will not appear at all. The total number of errors of all types is displayed in red at the top of the form.
Video demonstration(s) available:
Data Checking (version: 1.5)