Problem with linking two tables in CrystalReport

Question

Hi,

I have a CrystalReport which has one field from a second table and all the other fields from the first table.
If I only choose valut_id from the first table which should be a foreign key of the second table which primary key is id, it displays correct values. But if I put valut from the second table (the second field in the second table) I don't get the correct values in the report.
When I first open the report with the valut field chosen, it doubles the rows, but if I make a formula for not doubling, I get all the values for the field valut equal, which is not correct.
It acts as if the bothb tables are not connected.

Could anybody help me please?