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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/te9rel66/Data_Management/exporting_regional_language_report.htm

Question marks appear on exporting or emailing report or invoice as PDF in regional language. How do I solve this issue?

Use PDF creator to print reports or invoice in regional or other language, instead of exporting or emailing it in PDF format.

To print using PDF creator

1. Download latest Adobe Reader version, and install it on your computer.

2. Go to the report or invoice that you want to print in other language.

3. Click P : Print to print.

4. Click S : Select Printer .

5. Select PDF Creator .

6. Print the report or invoice.

7. Save the PDF file in the required location.