The solution to a previous MYOB Community post dated July 2020 stated:
If the discount column is not used i.e. left at 0.00%, when generating the invoice within MYOB Business the PDF/email copy of the invoice will not contain that column.
However the posted solution does not hold true in the following circumstance: If a blank row is inserted in the invoice, then the PDF/email copy of the invoice DOES contain the 0.00% discount.
This appears to be a bug. I required the use of the blank row, which MYOB have thoughtfully provided. Like many other MYOB users, I do not want to issue an Invoice advising my customers that they are not getting a Discount. MYOB have also provided a solution for this - except it doesn't always work, as described above.