select columns in cdtdifference

You need to customize both the cdts. First create copy of cdts and then set value to null for technical columns (which you don't want to include during comparison). Use primary Ids from resultant cdt to fetch all the data from actual cdt(i.e cdt1)

I hope this helps.

Thank you for your reply,
Is it possible to customize a cdt in an interface ? Is there any function or object for this purpose ?

Thank you in advance.

Yes, you can use updatecdt(). Here is an example:

local!copyofcdt: updatecdt( ri!cdtloan,{creationDate: {"", "", ""}, ModificationDate:{"", "", ""}} )

All the changes will be saved in local copy. And value for other columns will remain intact.

store the cdtdifference output in a local and then remove the values of those attribute name that are technical fields
by using remove ,wherecontains and index.