The aforesaid problem has been resolved by Tally Solutions in Tally ERP 9 Release 6.0.2 


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Read the release notes of Tally ERP 9 Release 6.0.2 as shown below :


Release Notes

The HSN/SAC was not displayed in the printed invoice when it was recorded with:

o     Stock items predefined with HSN/SAC.

o     Sales/purchase ledgers predefined only with tax rate and not the HSN/SAC.


This issue is resolved. Now, if the HSN/SAC is not defined in the sales/purchase ledger, but is available in any of the masters linked to the transaction, the same will be printed in the invoice.