Price/Unit digits change after export and import XER

Dear All:

Hello, I use primavera P6 Ver 8.3

I meet a problem about resource price/unit.

I manual key in the resource price/unit with 6 digits decimal, P6 can detect 6 digits and calculate the total cost.

(Although P6 only shows 2 digits, but actually it can use 6 digits to calculate)

But when I try to export a XER file, P6 will only export price/unit with 2 digits, and the total cost will be wrong.

How can I solve this probrem? 

THANKS FOR YOUR KINDLY HELP.