Certain Tax Codes Unavailable in Receivables Ledger

Hello there, I have created a new company with Sage 50 2021 student version. The company set up is complete, my suppliers have been entered. I am now in my Receivables Ledger to input customers, however, within the 'Taxes' tab, the only available tax codes in the drop down list are:

  • no Tax, and 
  • G (Gst @ 5%)

even though I have added a GP tax code (Gst + Hst) within my companies sales tax default codes. 

All tax code availability is set to "All Journals", I have gone back and re-entered the tax codes to ensure they were saved into my company profile but am still unable to select GP for my new customers. Any advice would be helpful. Thanks.