打开SAP C4C Cloud Application Studio，
进入Solution Explorer，右键菜单里选择Add -> New Item:
新建一个Business Object，取名CarPark:
源代码如下：
import AP.FO.BusinessPartner.Global;
import AP.Common.GDT as apCommonGDT;
businessobject CarPark
// *Further Development*
// declare an error message that is called if the BO fails validation
// raises Message_Car_Park_Full
{
// Root node must not be specified, it is created implicitly
//
// Add elements here.
//
// To declare an element as alternative key, use the [AlternativeKey]
// annotation.
//Please note:
// - An alternative key of type UUID exists implicitly for each node, enabling
// the node to be used as an association target.
// - The QueryByElements query is created automatically for each node.
// Code completion is available with CTRL + SPACE.
// *Further Development*
// define an error message to be displayed if the BO fails validation
// message Message_Car_Park_Full text "The car park is full - no spaces available";
// Car Park ID - (the company may have multiple car parks)
// - therefore we use this ID to identify the individual car park
element CarParkID : ID;
// additional information on the car park
element CarParkName : LANGUAGEINDEPENDENT_LONG_Text;
element CarParkDescription : LANGUAGEINDEPENDENT_LONG_Description;
element Number_of_ParkingSpaces : IntegerValue;
// *Further Development*
// add an element to display how many parking spaces are available
// element Number_of_ParkingSpaces_Available : IntegerValue;
// declare an action to calculate the available car spaces
// action Update_AvailableParkingSpaces;
// *Further Development*
// add an element to record location information
// this field is used with a URL mashup to display the location of the car park
// element CarParkLocation : LANGUAGEINDEPENDENT_MEDIUM_Description;
// each car park will have multiple parking spaces
// we create a node with 0 to n parking spaces
node ParkingSpace [0,n] {
// each parking space is assigned a unique identifier
element ParkingSpaceID : ID;
// display the ID of the Employee assigned to the parking space
element ParkingSpace_AssignedEmployeeID : ID;
// a parking space may be designated as a "Disabled Friendly" parking space
element ParkingSpace_Disabled : Indicator;
// is there an electric charging station for this parking space ?
element ParkingSpace_ElectricChargeStation : Indicator;
// display the license plate number of the employee's car
element Vehicle_RegistrationNumber : LANGUAGEINDEPENDENT_MEDIUM_Text;
// for a multi-level car park, we have the possibility to specify a level number
element ParkingSpace_Level : NumberValue;
// we need to create an association to the SAP BO "Employee"
// this allows us to include elements from the Employee BO in our screens
// a parking space may be associated to at most one employee
association ToEmployee [0,1] to Employee;
}
}
激活该BO，确保Activation Status为Runtime Objects up to date:
BO激活后，右键菜单选择Create Screens：
选择Screen Scenario with Thing-Based navigation：
会自动生成很多SAP Cloud for Customer 屏幕：
双击QA打开自动生成的UI，发现上面已经有一些来自BO抬头级别的字段了：
点工具栏上这个AddFlexLayoutRow按钮：
出现一个新的空白行：
将Toolbox里的控件AdvancedListPane拖到新建的FlexLayoutRow里：
选中某一个column，右键菜单里添加一个新的column：
现在我们有了一个表格，包含四列：
View菜单里打开：BO Browser / Data Model，使其显示在屏幕右边：
把ParkingSpaceID拖拽到第一列上去：
选择No：
从而建立了UI字段和BO 模型字段的绑定关系：
此处查看绑定关系：
显示employee ID的字段默认是input field，需要将其改成value help：
改成Object Value Selector：OVS
选择/SAP_BYD_APPLICATION_UI/publicovs/employeeid/
EmployeeID: 作为OVS Component：
把字段：ToEmployee.CurrentCommon.Person.Name.GivenName拖到第三列：
familyName拖到第四列：
把GivenName的display type设置为Static Text：
右边properties下拉菜单里，选择AdvancedListPaneVariant: ListPaneVariant：
useToolbar从false改成true：
设置成true之后，多了两个按钮：Add Row和Remove.
选中Add Row按钮，新建一个Event handler：
新建一个operation，类型为List：
Target List里，从下拉菜单选择/Root/DataList：
给Remove按钮也添加一个event handler：
再添加一个save action，确保Row被删除后自动保存：
选中identificationRegion:
点击Advanced：
选择CarParkID：
最终效果：
选中SectionGroup，可以对里面的字段进行位置顺序调整：
最后把用户分配到这个新建好的work center即可：
现在就可以进行测试了：
更多Jerry的原创文章，尽在："汪子熙":
