This exception may occur when service category is not selected during the transactions.
To resolve this exception
1. Go to Gateway of Tally > Display > Statutory Reports > Service Tax Reports.
2. Click the category Unable to determine Service Category.
3. Drill-down to the ledgers that do not have the service category defined.
4. Select the relevant service category against the ledger as shown below:
5. Press Ctrl+A to accept.
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