Backorder

Backorder: A distribution term that refers to the status of items on a purchase order in the event that some or all of the inventory required to fulfill the order is insufficient to satisfy demand. This differs from a forward order where stock is available but delivery is postponed for another reason.
Front-end and back-end are generalized terms that refer to the initial and the end stages of a process. The front-end is responsible for collecting input in various forms from the user and processing it to conform to a specification the back-end can use. The front-end is a kind of interface between the user and the back-end.
In software architecture and software design, the front-end is the part of a software system that interacts directly with the user, and the back-end comprises the components that process the output from the front-end. The separation of software systems into "front-ends" and "back-ends" is an abstraction that serves to keep the different parts of the system separated.
Back end systems are corporate systems that are used to run a company such as systems to manage orders, inventory and supply processing. Back end systems support the company's back office. This system collects input from users or other systems for processing.

Business Intelligence
unidirectional 单向的
Business Function Alternative name for Business Process
Business Logic 是一个非技术上的概念，通常用来描述处理用户界面和数据交换的功能算法。它不同于输入输出数据合法化和生产逻辑。
is a non-technical term generally used to describe the functional algorithms that handle information exchange between a database and a user interface. it is distinguished from input/output data validation and product logic.
Business logic 包括 Business Rules和Workflows。 Business Logic这个概念更多用在软件工程领域，比如用在软件结构上（Presentation， BusinessLogic， Databank三层结构）。