Import data : control before import

Hello,

when you import data, some of them could make error.
Is it possible to import in two time.

First, apply all constraints on data, and show errors or inconsistencies (like linked element not found, wrong type, etc...) and, in second time, doing the real import.

So we can check that data are consistent before doing import and no have to check with lines are in error to correct them ?

Expect to be clear.

regards,