How to rise error during synchronization?

Hello,

I have a basic synchronization project to import a bunch of CSV files. The data I would like to import in One Identity Manager looks like this : 

code1;valueA1;valueB1;valueC1

code2;            ;              ;valueC2

code3;valueA3;valueB3;

code4;valueA4;valueB4;valueC4

Basically I want to make sure there is not empty value in the line before importing it. Otherwise, I would like to skip this line and generate an error in the log of synchronization project (in this example, line 3 and line 2, would be skipped).

How can I generate an error and then skip the line in one the columns is empty?

Thank you,

Mustapha