How to connect smartfield to odata service? - sapui5

Question

I have a SmartField that I would like to connect to a ODATA service to get valueHelp for free.
The model, that points to the ODATA service looks as following:
"EAMMALFUNCTION": {
"uri": "/sap/opu/odata/sap/EAM_MALFUNCTION_MANAGE/",
"type": "sap.ui.model.odata.v2.ODataModel",
"settings": {
"defaultOperationMode": "Server",
"defaultBindingMode": "OneWay",
"defaultCountMode": "Request"
},
"dataSource": "EAM_MALFUNCTION_MANAGE",
"preload": true
}
And the uri to the entityset is /sap/opu/odata/sap/EAM_MALFUNCTION_MANAGE/I_PMContactCardEmployee and meta definition is:
<EntitySet Name="I_PMContactCardEmployee" EntityType="EAM_MALFUNCTION_MANAGE.I_PMContactCardEmployeeType" sap:creatable="false" sap:updatable="false" sap:deletable="false" sap:searchable="true" sap:content-version="1"/>
<EntityType Name="I_PMContactCardEmployeeType" sap:label="Mitarbeiter" sap:content-version="1">
<Key>
<PropertyRef Name="PersonnelNumber"/>
</Key>
<Property Name="PersonnelNumber" Type="Edm.String" Nullable="false" MaxLength="8" sap:display-format="NonNegative" sap:text="EmployeeFullName" sap:label="Personalnummer"/>
<Property Name="EmployeeFullName" Type="Edm.String" MaxLength="80" sap:label="Vollständiger Name" sap:filterable="false"/>
<Property Name="FirstName" Type="Edm.String" MaxLength="40" sap:label="Vorname" sap:quickinfo="Vorname des Geschäftspartners (Person)"/>
<Property Name="FamilyName" Type="Edm.String" MaxLength="40" sap:label="Nachname" sap:quickinfo="Nachname des Geschäftspartners (Person)"/>
<Property Name="Job" Type="Edm.String" MaxLength="8" sap:display-format="NonNegative" sap:label="Stellenschlüssel" sap:quickinfo="Stelle" sap:filterable="false"/>
<Property Name="JobName" Type="Edm.String" MaxLength="25" sap:label="Stellenbezeichnung" sap:filterable="false"/>
<Property Name="CompanyCode" Type="Edm.String" MaxLength="4" sap:display-format="UpperCase" sap:text="CompanyCodeName" sap:label="Buchungskreis"/>
<Property Name="CompanyCodeName" Type="Edm.String" MaxLength="25" sap:label="Name der Firma" sap:quickinfo="Buchungskreis- oder Firmen-Bezeichnung" sap:filterable="false"/>
<Property Name="OrganizationalUnit" Type="Edm.String" MaxLength="8" sap:display-format="NonNegative" sap:label="Organisationseinheit"/>
<Property Name="OrganizationalUnitName" Type="Edm.String" MaxLength="25" sap:label="OrgEinheitenkurztext" sap:quickinfo="Organisationseinheitenkurztext" sap:filterable="false"/>
<Property Name="PhoneNumber" Type="Edm.String" MaxLength="30" sap:display-format="UpperCase" sap:label="Telefon" sap:quickinfo="Telefonnummer: Vorwahl+Anschluß" sap:filterable="false"/>
<Property Name="NormalizedPhoneNumber" Type="Edm.String" MaxLength="30" sap:display-format="UpperCase" sap:label="Telefonnummer" sap:quickinfo="Vollständige Nummer: Vorwahl+Anschluß+Durchwahl" sap:filterable="false"/>
<Property Name="MobilePhoneNumber" Type="Edm.String" MaxLength="30" sap:display-format="UpperCase" sap:label="Telefon" sap:quickinfo="Telefonnummer: Vorwahl+Anschluß" sap:filterable="false"/>
<Property Name="MblNormalizedPhoneNumber" Type="Edm.String" MaxLength="30" sap:display-format="UpperCase" sap:label="Telefonnummer" sap:quickinfo="Vollständige Nummer: Vorwahl+Anschluß+Durchwahl" sap:filterable="false"/>
<Property Name="DefaultEmailAddress" Type="Edm.String" MaxLength="241" sap:label="E-Mail-Adresse"/>
<Property Name="UserID" Type="Edm.String" MaxLength="12" sap:display-format="UpperCase" sap:label="Benutzer-ID" sap:filterable="false"/>
</EntityType>
supplies the following data:
{
"d": {
"results": [
{
"__metadata": {
"id": "https://example:4000/sap/opu/odata/sap/EAM_MALFUNCTION_MANAGE/I_PMContactCardEmployee('00000019')",
"uri": "https://example:4000/sap/opu/odata/sap/EAM_MALFUNCTION_MANAGE/I_PMContactCardEmployee('00000019')",
"type": "EAM_MALFUNCTION_MANAGE.I_PMContactCardEmployeeType"
},
"PersonnelNumber": "00000019",
"EmployeeFullName": "Test Normi_20180206",
"FirstName": "Normi_20180206",
"FamilyName": "Test",
"Job": "00000000",
"JobName": "",
"CompanyCode": "CH01",
"CompanyCodeName": "Country Template CH",
"OrganizationalUnit": "50000066",
"OrganizationalUnitName": "",
"PhoneNumber": "",
"NormalizedPhoneNumber": "",
"MobilePhoneNumber": "",
"MblNormalizedPhoneNumber": "",
"DefaultEmailAddress": "",
"UserID": ""
},
{
"__metadata": {
"id": "https://example:4000/sap/opu/odata/sap/EAM_MALFUNCTION_MANAGE/I_PMContactCardEmployee('00000014')",
"uri": "https://example:4000/sap/opu/odata/sap/EAM_MALFUNCTION_MANAGE/I_PMContactCardEmployee('00000014')",
"type": "EAM_MALFUNCTION_MANAGE.I_PMContactCardEmployeeType"
},
"PersonnelNumber": "00000014",
"EmployeeFullName": "TEST Einchäuferli",
"FirstName": "Einchäuferli",
"FamilyName": "TEST",
"Job": "00000000",
"JobName": "",
"CompanyCode": "CH01",
"CompanyCodeName": "Country Template CH",
"OrganizationalUnit": "50000055",
"OrganizationalUnitName": "",
"PhoneNumber": "",
"NormalizedPhoneNumber": "",
"MobilePhoneNumber": "",
"MblNormalizedPhoneNumber": "",
"DefaultEmailAddress": "",
"UserID": "M4711"
},
What am I trying to archive is, to connect the SmartField with the ODATA service and get valueHelp for free without any specific coding for value help.
When I select a value on the value help, then it should insert the PersonnelNumber into the SmartField.
The I_PMContactCardEmployee is a CDS consumption view and it provides an interface to search help:
#AbapCatalog.sqlViewName: 'IPMCONTCARDEMP'
#AbapCatalog.compiler.compareFilter: true
#AccessControl.authorizationCheck: #CHECK
#VDM.viewType: #COMPOSITE
#EndUserText.label: 'Employee'
#ObjectModel.representativeKey : 'PersonnelNumber'
#Search.searchable: true
#ClientHandling.algorithm: #SESSION_VARIABLE
#ObjectModel.usageType.dataClass: #MASTER
#ObjectModel.usageType.serviceQuality: #D
#ObjectModel.usageType.sizeCategory: #L
#AccessControl.personalData.blocking: #REQUIRED
define view I_PMContactCardEmployee
I already tried to connect the SmartField with the I_PMContactCardEmployee service as following:
<smartField:SmartLabel labelFor="pmAssignTo" />
<smartfield:SmartField id="pmAssignTo" binding="{EAMMALFUNCTION>/I_PMContactCardEmployee}" value="{PersonnelNumber}">
<layoutData>
<layout:GridData span="L7 M7 S12"/>
</layoutData>
</smartfield:SmartField>
and I've got the error message:
Uncaught (in promise) Error: Cannot add direct child without default aggregation defined for control sap.ui.comp.smartfield.SmartField