I am trying to create a VF page that has a sets of controlling picklists. CBO_Type controls CBO_Name. when I try to display the page, I get this error: "The inline edit-enabled dependent picklist 'CBO Name' requires its controlling field 'CBO Type' to be present on the page." 

Here is my page and controller extension....

Page:
<apex:page standardController="Discharge__c" extensions="DischargeCboRelatedExtension" lightningStylesheets="true">
<apex:form >
        <apex:pageBlock title="{!Discharge__c.Name}'s - CBOs" mode="inlineEdit" >
            <apex:pageBlockButtons location="top" >
                <apex:commandButton style="background:lightblue" value="New CBO" action="/003/e?retURL={!discharge__c.id}&accid={!discharge__c.id}" />
                <apex:commandButton style="background:lightblue" action="{!save}" value="Save" id="saveButton" />
                <apex:commandButton style="background:lightblue" onclick="resetInlineEdit()" id="cancelButton" value="Cancel" />
            </apex:pageBlockButtons>
              <apex:pageBlockTable value="{!cbos}" var="item" style="background:skyblue">
                   <apex:column headerValue="Action" >
                            <apex:outputLink value="/{!item.id}/e?retURL=/apex/accountDisplay/{!Discharge__c.id}" target="_parent">Edit
                            </apex:outputLink>&nbsp;|&nbsp;
                           
                     <apex:outputLink value="{!URLFOR($Action.Contact.Delete, item.id)}&retURL=%2F{!Discharge__c.id}" target="_parent" onclick="return window.confirm('Are you sure?'); ">Delete
                      </apex:outputLink>       
                 </apex:column>  
                  
                                       
                <apex:column value="{! item.referral_date__c}" />
                <apex:column value="{!item.CBO_Type__c}" />
                <apex:column value="{! item.cbo_name__c}" />
                <apex:column value="{!item.Referral_Status__c}" /> 
                 <apex:column value="{!item.rejection_cancellation_reason__c}" />
                  <apex:column value="{!item.Start_of_Service__c}" />
                  <apex:column value="{!item.End_of_Service__c}" />
               
             <!--   <apex:column headerValue="Phones" >
                    <apex:outputField value="{!item.CBO_Type__c}">
                    <apex:inlineEditSupport showOnEdit="saveButton,cancelButton"
                        hideOnEdit="editButton" event="ondblclick"
                        changedStyleClass="myBoldClass" resetFunction="resetInlineEdit"/>
                </apex:outputField>

                </apex:column> -->
            </apex:pageBlockTable>
        </apex:pageBlock>
    </apex:form>
</apex:page>

Controller:
public class DischargeCboRelatedExtension {
    public List<Cbo__c> cbos {get;set;}

        public DischargeCboRelatedExtension(ApexPages.StandardController stdController) {
        this.cbos = [select id,cbo_type__c, cbo_name__c, cbo_address__c, phone_number__c,fax_number__c,referral_date__c,referral_status__c,rejection_cancellation_reason__c,start_of_service__c,end_of_service__c,secondary_organization__c from CBO__c where Discharge_Name__c =:stdController.getId()];

    }
        public PageReference save() {
        update cbos ;
        return null;
    }
}