Eloqua - CDO - Update row only if import is newer

Hello,

I'm facing a "little" problem.

What I want to do :

I created a CDO that contains 3 fields : Email (TEXT)(UNIQ), Date(DATE), IsAllowed(NUMERIC).

I recieve a file that contains a lot of rows to import/update. With fields : Import_Email, Import_Date, Import_IsAllowed

During the upload, I want to import all non-present fields --> OK

My problem is for the update part.

I just want to update rows when "Import_Date" is > than "Date".

When I try to create contional update rules, I can only set a static date, but I need to compare the 2.

Someone can help me please ?