In Australia you must have the words "TAX INVOICE" on the top of all invoices.
This should be maintained by some configuration settings also
I have just altered the language file but that gets overwritten each update. It can get you into a lot of trouble collecting GST and not having TAX INVOICE on the print out because it means the customer cannot claim the GST spent.
Yes we need a solution which is supported by WHMCS Updates also
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