Hi, Sorry to tell you but Tally has changed Data Structure in Tally.ERP9 from which they used in earlier Tally 5.4, 6.3, 7.2 & 8.1.
When you migrate Data of Tally 7.2 to Tally.ERP9, your entire Data Structures will be changed and you can not bounce back from new data structure to old Data Structure.
IRM Offshore & Marine Engg. Pvt. Ltd.,
Ahmedabad, Gujarat, India
Mobile : 9426715787