AR Interface Conversion Rate - where it defaulted?

Hi,

Where does the Conversion Type in AR Interface line defaulted from?

We have a project which uses Corporate Cross Rate (Conversion Type) in Projects > Currency setup in both Project and Task level. Events are made using Corporate Cross Rate type as well.

But when interfaced to AR, the Conversion Type in Interface table were defaulted to User (Conversion Type), instead of Corporate Cross Type.

Anybody could help to default Corporate Cross Rate in AR Interface Conversion type or to copy it from Projects? Thank you so much.