Run script below to insert the default tax code value
if not exists (select AcTaxEffectiveAsID from AcTaxEffectiveAs where AcTaxID = 'SR0') BEGIN
Insert Into AcTaxEffectiveAs (AcTaxEffectiveAsID,AcTaxID,EffectiveFrom,EffectiveTo,TaxPercent,AcSystemTaxID,CreateBy,CreateDate,EditBy,EditDate,Stamp)
Select NewID(),AcGSTTaxCode,'1899-1-1','3000-1-1',GSTTax,AcGSTTaxCode,'SYSTEM',GETDATE(),'SYSTEM',GETDATE(),0 From AcGSTTax
End