字段更新中的字段可选项应该排除掉公式、汇总和自动编号只读字段
Created by: yinlianghui
按sf文档是这样说的，实际规则可以先上sf测试确认下先。
sf文档:Field Update Action Limitations
These fields aren’t available for field update actions: Read-only fields like formula or auto-number fields The Language picklist field on multilingual solutions Some activity fields, such as Related To and Private