In order to use the option Version Compatability Check , you need to have .ddif file.
By default, the DDIF file of the latest release is present in the Tally.Developer 9 folder. DDIF file generated for any of the Tally.ERP 9 releases, is available in the respective folder. Repeated generation of the DDIF file is not required.
To load the Default TDL code of the base release
1. Go to Tools > Preferences > Compiler/Execution Options .
2. Browse and select the Tally.ERP 9 Exe Path field, for which the customisation project was created.
3. Check Load Default/Base TDL Reference from Tally.ERP 9 exe path check box. Click OK .
4. Right-click on the Default TDL project in the project browser, when the Default TDL code for the selected Tally.ERP 9 release is loaded.
5. Click Generate Compatibility Metadata .
6. tdlserver.ddif file will be created in the Tally.ERP 9 folder.