无法在SAP Fiori UI上添加扩展字段？原因可能就在这里

I have created the following extension field on business context : product master general

However, when I try to add it to Fiori UI, I could not find it from available field list:

I am debugging the logic of this available field list to try to find why.After debugging I found the root cause. Now my extension field is added to UI successfully:

For detail analysis please see this link：

Why my extension field does not appear in Available Fields list for extension