customer report - due date, currency mix up

[tereque]

hi,

a customer's invoice was due dec 31. it was paid today (Jan 4). There 
where USD 9,- missing, so still USD 9,- are due (actually overdue already).

I have a "customer report" which list the invoice USD 3057,- and the 
payment USD 3048,- with correct dates. Also it says correctly TOTAL DUE 9,-

problem:

1. It lists 9.- CNY (Chinese Yuan) and not USD. many of my accounts are 
CNY accounts but this customer and income accounts, invoice all is USD

2. below the TOTAL DUE there is kind of a timeline which also is in CNY 
and not USD. Furthermore these CNY 9.- are listed under 0-30 days and 
not in CURRENT (as would be correct)

any ideas how to solve these issues?

many thank