V5 Currency Problem

Hi everyone,
I just upgrade one of my client’s v3 to v5 without any issue. The reason that i upgraded to v5 is currency problem. And i still having same problem. I read all documentations about that but still no luck. My problem is ;
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I have read some ppl fixed this with changing “Rate Decimal Places” but no luck for me.
I will be very happy if someone help me about that. Thank you.