Lookup Import 2 or more fields

Greetings Community,
I am having 2 forms , 1 form is customer form that contains 1) first name , 2) last name 3) Autonumber ( unique value )Data is already imported to this form.
The tricky part now, the product form contains lookup field from customer form that contains 1) last name , 2) first name 3) Auto number ( unique value ).
No matter what i tried, i can't import anything in the products form when i am using more that 1 fields on the lookup field.When i am using ONLY last name its working. When i am using last + first name its NOT working.As well when i tried to use last name + first name + auto number its NOT working.
I search around all forum and i tried to workaround with spaces , to check special views for lookup fields , to try to import auto number field only and then switch the report view but nothing works.
The result that i want in products form is to have Last Name - First Name - Auto number(or any unique value) - Product number - ... - and more fields from product form.
I would be really happy if someone could help me with this.Dimitris
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