If reports are localized or use culture sensitive formatting in expressions, it is important to change the current thread's culture before instantiating the report. Reports are processed and rendered based on the thread's culture information - Localization
If the issue is related only to expressions using the Format built-in function, replace the expression with the TextBox item's Format property. Thus setting the TextBox.Culture
will affect the result beside the current thread's culture - Report Globalization
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