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Release 5.2 bug fixes Service Tax
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https://help.tallysolutions.com/docs/te9rel52/Release_5-2/Service_Tax.htm

Service Tax

      While recording a sales or purchase voucher, the Service Tax Category Details screen was opening for ledgers with service tax not applicable, resolved: When a sales or purchase voucher was recorded, and a ledger with service tax not applicable was selected, the Service Tax Category Details screen was displayed. This occurred when, 

o      Define service category and tax details as masters? in F11: Features of service tax was set to No.

o      Allow modification of tax details for service tax? was set to Yes in F12: Configure of sales or purchase voucher.