Any bill generated from GST format cannot be deleted. If you wish to remove the record, please create a Credit Note for that invoice to reverse the whole transacted amount to nullify the transaction.
To set up for non-GST format:
Open Housekeeping, Run Setup, General Setup.
In the Company Profile, look for MALAYSIA GST and Untick this option.
Select Yes, I would like to make the change to the tax code status to obsolete.
Click OK, OK, and OK until you exit the setup.
Go to Housekeeping, Run Setup, and General Setup.
Select Transaction.
In the Add Body Section, look for Select Tax code from tax code maintenance and:
Select this if you are charging SST.
If you are not charging SST, leave it un-ticked.
Click OK.
Open Housekeeping, Run Setup, Administrative Tools, and select Settings 2.7.
In Tax Code Settings, delete all the default tax codes.
Thereafter, when you create Bills, it will not select any related GST tax codes and print GST format bills.
All the invoices that are created during the GST function cannot be removed or deleted.