DMEE Condition in custom tree format

Hello Experts,

I am stuck with one condition in DMEE tree.

I have 2 fields in my tree namely country and currency.

Current is mapped to LDISO and

Currency is mapped to UBWAE of FPAYHX structure.

The values in the country and currency fields are pulled as per configuration. My requirement is based on a  particular value for country say "XYZ" I need to change the currency to "ABC" whereas the value maintained is "123".

Please help.

Thanks,

Urvashi