Your buying method is incorrect. You should fill in the buy 159901 in "Stock Buying" through the brokerage's trading software. In other words, you are buying stocks. This trading method is the same as buying stocks. The stocks are the same, starting from 100 shares. This is secondary market buying.

And your "exchange fund subscription and redemption" belongs to the primary market purchase. In addition, ETF cannot be purchased in cash, so the system says it is not an open-end fund.