SUMMARY
I have signed up for the Salesforce Partner Program and have created a managed app called ABC Company using my Partner Developer Edition account (dev org).

The app consists of one parent custom object (Project__c) and two child custom objects (Sent_item__c & Received_item__c).

I have a visualforce PDF page that displays the Project Summary with the Sent and Received related lists. For this VF PDF Page I have created an Apex Class that sorts/orders the list by Name ASC for Sent and Received Related Lists. I also have an apex test class with 100% code coverage.

The Generate Visualforce PDF Page works without any problems in my Partner Developer Edition account (dev org).

PROBLEM
After successful installation of my app on my Enterprise/Platform Edition account (Test Org) as a managed app I receive the following error when I try to generate the VF page:

common.apex.runtime.impl.ExecutionException: SObject row was retrieved via SOQL without querying the requested field:ecpfinal__Project__c.Name

(The error only occurs in my managed solution when installed on another Enterprise/Platform Edition account (Test Org))

Can you provide the necessary code to fix this error? Do I need to add additional code to the apex class?

VISUALFORCE PDF PAGE (Project_Summary)
<apex:page standardController="Project__c" sidebar="false" showHeader="false" renderAs="pdf" extensions="ProjectSummaryPDFController">
<hr></hr>
   <h3>PROJECT SUMMARY</h3>
<hr></hr>
 <table  style="width: 100%;">
<tr><td style="width: 25%;">Project Number:</td><td style="width: 75%;">{!Project__c.Name}</td></tr>
<tr><td style="width: 25%;">Project Name:</td><td style="width: 75%;">{!Project__c.Project_Name__c}</td></tr>
<tr><td style="width: 25%;">Contractor:</td><td style="width: 75%;">{!Project__c.Contractor__c}</td></tr>
 </table>
 <hr></hr>
   <b>SENT ITEMS</b>
<hr></hr>
<apex:dataTable value="{!cvSentItemLineItemsSorted}" var="item" border="1" cellpadding="3" width="100%" >
<apex:column >
<apex:facet name="header">Item Number</apex:facet>
<apex:outputText value="{!item.Name}"/>
</apex:column>
<apex:column >
<apex:facet name="header">Description</apex:facet>
<apex:outputText value="{!item.Description__c}"/>
</apex:column>
 </apex:datatable>
<hr></hr>
   <b>RECIEVED ITEMS</b>
<hr></hr>
 <apex:dataTable value="{!cvReceivedItemLineItemsSorted}" var="item" border="1" cellpadding="3" width="100%" >
<apex:column >
<apex:facet name="header">Item Number</apex:facet>
<apex:outputText value="{!item.Name}"/>
</apex:column>
<apex:column >
<apex:facet name="header">Description</apex:facet>
<apex:outputText value="{!item.Description__c}"/>
</apex:column>
 </apex:datatable>
  <hr></hr>
</apex:page>


APEX CLASS
public with sharing class ProjectSummaryPDFController {
       //set up the class variables we'll need to reference from VF page
       public List<Sent_item__c> cvSentItemLineItemsSorted {public get; private set;}
       public List<Received_item__c> cvReceivedItemLineItemsSorted {public get; private set;}
       
       //variable to hold current Project__c record
       private Project__c cvSelectedProject = null;
       
       //constructor
       public ProjectSummaryPDFController(ApexPages.StandardController pCntrllr)
       {
               // grab current Project__c record from the Standard Controller
               cvSelectedProject = (Project__c)pCntrllr.getRecord(); 
                       
               // build sorted List of Sent_item__c records for current Project__c
               cvSentItemLineItemsSorted = new List<Sent_item__c>();
               cvSentitemLineItemsSorted = 
                       [Select item.Name,
                               item.Description__c
                        From Sent_item__c item
                        Where item.Project_Number__c =: cvSelectedProject.id
                        ORDER BY item.Name ASC
                        limit 1000];
               
               // build sorted List of Received_item__c records for current Project__c
               cvReceivedItemLineItemsSorted = new List<Received_item__c>();
               cvReceivedItemLineItemsSorted = 
                       [Select item.Name, 
                               item.Description__c
                        From Received_item__c item
                        Where item.Project_Number__c =: cvSelectedProject.id
                        ORDER BY item.Name ASC
                        limit 1000];                         
       }     
}


APEX TEST CLASS
@isTest
private class testProjectSummaryPDFController {

   static testMethod void myUnitTest() {
        
       // make a valid Project__c record we will sent to PDF controller
       Project__c lvProject = makeValidProject();
       
       // make a Sent_item__c record for the project
       Sent_item__c lvSentItemObj = makeSentItemObj(lvProject);
       
       // make a Received_item__c record for the project
       Received_item__c lvReceivedItemObj = makeReceivedItemObj(lvProject);
       
       // first get the standard controller for my object and pass in the Project obj
       ApexPages.StandardController lvStdCntrllr = new ApexPages.standardController(lvProject);

       // now create an instance of my controller
       ProjectSummaryPDFController controller = new ProjectSummaryPDFController(lvStdCntrllr);

   }
       
static private Project__c makeValidProject() {
       // create Test Project record 
       Project__c lvProj = new Project__c();
       lvProj.Name = 'Name';
   lvProj.Project_name__c = 'Project Name';
       lvProj.Contractor__c = 'Contractor';
       
       insert lvProj; 
       
       return lvProj;
   }
   
   static private Sent_item__c makeSentItemObj(Project__c pProj) {
       Sent_Item__c lvObj = new Sent_Item__c();
       lvObj.Name = 'Name';
       lvObj.Description__c = 'Description';
       lvObj.Project_Number__c = pProj.Id;
       
       insert lvObj; 
       
       return lvObj;
   }
   
   static private Received_item__c makeReceivedItemObj(Project__c pProj) {
       Received_item__c lvObj = new Received_item__c();
       lvObj.Name = 'Name';
       lvObj.Description__c = 'Description';
       lvObj.Project_Number__c = pProj.Id;
       
       insert lvObj; 
       
       return lvObj;

   }
}