https://help.tallysolutions.com/docs/te9rel64/release_notes/release_6.4.5.htm

Release Notes for Tally.ERP 9 Release 6.4.5 - GCC

If you are using Release 6.4.4 and have enabled Show place of supply option while creating an inter-emirate sales transaction, the place of supply doesn't get derived. This error has been resolved in Release 6.4.5. We highly recommend that you download and use Tally.ERP 9 Release 6.4.5 .