Hi Vlad,
What version of Adagio Receivables is the client using? Were the transactions posted using Adagio Receivables, or are they still using Accpac Plus AR?
I tested by using the current version of Adagio Receivables 9.0C (2012.02.24) and created a new invoice batch. In all of the reference and both description fields, I inserted 'French' ASCII characters by copying them from a Word document and pasting them into the fields. After posting the invoice, I could correctly see the invoice on the Aged Trial Balance and Overdue Receivables reports (the two reports I tried). Granted, my laptop is defined with Windows in English, but I could not replicate a problem with the AR transaction reports simply by having French characters in the reference and description fields.
If you wanted to determine if 'French Windows' is involved, get a copy of your clients data and in your office, try previewing the same report. If the transactions with French characters print on the report, then the environment is getting in the way. If you see the same problem in your office, then we can take a look using the same copy of the data.
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Regards,
Softrak Tech Support