Unlike the My Appointment application where the appointments data of given time period is calculated in the frontend ( discussed in this issue, when you choose Appointment from drop down list in My Account application, in this scenario the time period acting as filter is calculated in the backend.
一直到这一个步骤, it_filter_options都是空的：
首先将ui传进来的filter存到lt_filter_select_options:
然后在这个方法里添加其他filter ：
这是通过ABAP 代码在后台添加的filter：
