The GST ledger may not appear after calculating GST if the configuration settings are not properly set. Specifically, the 'ITC applicable' option must be checked. If this option is unchecked, the GST field will not be displayed in the ledger.

Solution:

Verify the GST ledger configuration and ensure that 'ITC applicable' is enabled. Once this setting is corrected, the GST ledger will appear correctly after calculation.