AP invoice distributions are duplicated in FA

Hello,

I have encountered a possible issue in FA (EBS R12) but I'm not sure since I never worked with FA before. The AP invoice has two item lines and related tax lines. The first item line has two distribution lines like following:

1. Item
2. Exchange Rate Variance

The second item line has following distributions:

1. Item
2. Invoice Price Variance

If I query the related asset number in FA and check the source lines, there is a duplicate line for both Exchange Rate Variance and Invoice Price Variance.  What could be the problem?

Thanks in advance!

/Rikard