Cause

That error occurred because the user does not enter tax in GST inward entry.

Solution

1. Go to Transactions > GST Inward (Expenses) > Modify.

2. A Modify window will appear. Select the options as per the Requirement i.e. bill no, bill date, etc.

3. A GST Inward As on the window will appear. Press enter on selected bill.

4. A GST Inward Alternation window will appear. Click on the Modify. tab. 

5. Then cursor will move to the party name user press enter key.

6. Now, cursor will wait on an item so the user has to press the 'F2' function key on the selected item.

7. An Item levies window will appear. In 'Taxable', the user will set 'T' by space bar key.

8. Press page down key.

9. The user will save the details by pressing ‘CTRL+W’ on the blank line.

10. Then ‘Save Changes’ Window will appear. The user will press enter on ‘Yes’ to save the changes.