Import data with lookup references

Hi,

I'm trying to import data to dynamics CRM using the data import template. The table I'm trying to import to contains lookup columns a and there is data already there which has been added through forms. However when I export this data I see that the data in the lookup uses a non-unique reference, such as "Yes", even though a unique ID field exists (I assume because it's not the primary field?).

So when I try to import data using the unique ID field, I get a "reference could not be resolved" error, and there is no other way of referencing a unique column.

Could anyone propose a way around this, such as changing the relationship mapping?

Thanks!