Default account assignment for Rate difference for sales a/c

When we try to clear the vendor through F110 we are facing error. Document posted with SDRU currency. It is expiry currency. It need to clear through USD . Vendor contain customer in the master data. But we are unable post in System No 1

Another system we are able to post. It is automatically taking GL accounts for rate difference accounts for sales and purchase accounts.

Here the entry is like below

001 18 vendor 139,99

002 25 Customer 488,98

003 50 Bank 340,98

004 40 Rate difference for sales a/c 4,69

005 50 Rate difference for purchases 12,70

We want to compare both systems to find out the reason why it is not posing in one system

Rate difference for purchases account assigned to OBYC-KDM

But we are unable to find the Gl account Rate difference for sales a/c where it is assigned.

We have seen OBKP, VKOA, OBA1 . Please let us know where this Rate difference for sales a/c may be assigned

Please let us know Default account assignment for Rate difference for sales a/c