Fail to create DraftOrder with a Discount via GraphQL Admin API

[Ashley_Ng_16]

Our app had 2 problems related to creating Draft orders by GraphQL API:

1. According to the Shopify Document, in DraftOrderCreate, the input field 'appliedDiscount.amount' is not required. However, when we tried to create a draft order, we received the message: '[{\"field\":[\"lineItems\",\"0\",\"appliedDiscount\",\"amount\"],\"message\":\" Applied discount amount must be greater than 0\"}]. 

=> Can you explain this problem? Is there any update we should know and what is the workaround for this problem?

2. Our app is using draft-order-create mechanism so that our customers can checkout with our app discount code. Previously, when creating draft orders, we transmitted information on appliedDiscount.value and 

appliedDiscount.presentmentCurrencyCode; then your system will automatically convert the value to the customers' currency. But, recently, we've noticed that the system no longer worked like that.

=> Can you explain this problem? Is there any update we should know and what is the workaround for this problem?