Dear Bee Ling
Just to update. All of your attached ERP issue had settled except for point no #3 about 0% GST/VAT not able to capture.
We are still working on this issue.
We have tested but did not apply in LIVE environment due to data not reflected correctly in the GST/VAT report.
For 0% GST, currently the support team suggested to key in header but it can't identify a transaction is a debit or credit.