I have a requirement to build a custom component for Customer Community to create a new case. On the form I have a lookup field to a custom object that doesn't want to work. Are lookups to custom objects suppose to work in communities? Here's a simplified version of my code. 

    <aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
    <aura:attribute name="Case" type="Case"  />
    <aura:attribute name="newCase" type="Object"  />
    <aura:attribute name="simpleNewCase" type="Object" />
    <aura:attribute name="newCaseError" type="String" />
    <force:recordData aura:id="caseRecordCreator"
                      fields="Location__c,LocationTest__c,Number_of_Required_Extensions__c,Primary_Use_for_Numbers__c,Extension_End_Range__c"
                      targetRecord="{!v.newCase}"
                      targetFields="{!v.simpleNewCase}"
                      targetError="{!v.newCaseError}" />
    
    <!-- First we initialize the form -->
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
    
    <lightning:recordEditForm objectApiName="Case"
                              onsubmit="{!c.handleSaveCase}" >
                            <lightning:inputField fieldName="Location__c" />
                            <lightning:inputField fieldName="OwnerId" />
                            <lightning:inputField fieldName="LocationTest__c" />
                            <lightning:inputField fieldName="ContactId" />
                            <lightning:input label="Input" value="{!v.case.LocationTest__c}"/>
    </lightning:recordEditForm> 
        
    </aura:component>


    ({
	doInit : function(component, event, helper) {
        //Standard way to load a record template using Lightning Data Service
        component.find("caseRecordCreator").getNewRecord(
        	"Case",
            "0122a0000008c9lAAA",
            false,
            $A.getCallback(function(){
                var rec = component.get("v.newCase");
                var error = component.get("v.newCaseError");
                if(error || (rec === null)){
                    console.log("Error initializing record template: " + error);
                }else{
                    console.log("Record template initialized" + rec.sobjectType);
                }
            })
        );
	},
    
        handleSaveCase : function(component, event, helper){
        //This is how we link the new Contact with the actual Account Id
        //component.set("v.simpleNewCase.AccountId", component.get("v.simpleUser.AccountId"));        
        //alert("{!v.simpleUser.AccountId}");
        //component.set("v.simpleNewCase.ContactId", component.get("v.simpleUser.ContactId"));
      
        //Standard way to save a record using Lightning Data Service
        component.find("caseRecordCreator").saveRecord(function(saveResult){
            if(saveResult.state === "SUCCESS" || saveResult.state === "DRAFT"){
                //resultToast is a pop-up window that show messages.
                var resultsToast = $A.get("e.force:showToast");
                resultsToast.setParams({
                    "title" : "Case saved",
                    "message" : "The new case was created",
                    "type" : "success"
                });

                $A.get("e.force:closeQuickAction").fire();
                resultsToast.fire();
                $A.get("e.force:refreshView").fire();
            }else if(saveResult.state === "INCOMPLETE"){
                console.log("User is offline, device doesn't support drafts.");
            }else if(saveResult.state === "ERROR"){
                console.log("Problem saving case, error" + JSON.stringify(saveResult.error));
            }else{
                console.log("Unknown problem, state: " + saveResult.state + ', error: ' + JSON.stringify(saveResult.error));
            }
        });
    }
})

Why isn't the Location lookup showing any values?