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Filtering LookUp Drop Down (Duplicates or Unique Values) in Model Based Driven App with Javascript Web Resources

I currently have a Model Based Driven App. In short, I have Four Lookup fields--Company, Approver, MDM, and SSC Approver--and a Web Resource that filters out the selected option for each field. However, the first Lookup field isn't filtering out the selection of companies like it's supposed to do. There are still multiple duplicate fields. (I'll explain why there are duplicate fields in a little bit). I need help filtering out the duplicate fields.
I'll start by describing each of the relevant parts of my application: its tables, the form, and finally--the web resource written in JavaScript. I have three relevant tables for the Model Based Driven App. The first is "EVR" for the forms and views from the Model Based Driven App. The relevant rows look something like this:

Company (LookUp to AB Company)| Approver (LookUp to User)| MDM (Lookup to User)| SSC Approver (Lookup to User)

The second table is "AB_Company."
Company (Name)| Approver (LookUp to User)| MDM (Lookup to User)| SSC Approver (LookUp to User)
Company 1 | Eric | Jill | Bryan
Company 1 | Bill | Jill | Bryan
Company 1 | Jen | Jill | Bryan
Company 2 | Eric | Jill | Bryan

The third table is merely "User" and contains the names mentioned above for the Lookup(s).

The problem that I'm facing right now is that the first Lookup features duplicate entries. As I've shown in the second table for AB_Company, the duplicates are to ensure that the multiple users are referenced to the same company by row. The duplicate entries look something like this in the model-based driven app.

With the Web-Resource, the fields for Approver, MDM, and SSC Approver are filtering the Users as expected/desired.

The question that I have before I share the code from the web resource and describe the event that triggers it in further detail is this: how do I render my JavaScript so that the first field either doesn't display the duplicate values or only shows the unique ones? I'm also open to alternative options. Here's the JavaScript code for the web resource:

function onlyUnique(value, index, self){
    return self.indexOf(value) == index;

var Sdk = window.Sdk || {};
(function () {
    // Define some global variables
    var myUniqueId = "_approvalExpenseVendorForm"; // Define an ID for the notification
    var currentUserName = Xrm.Utility.getGlobalContext().userSettings.userName; // get current user name
    var message = currentUserName + ": Your JavaScript code in action!";
    // Arrays to store individual Approver, MDM and SSCApprover GUIDs from User table
    var arrayOfApprovers = [];
    var arrayOfMDMs = [];
    var arrayOfSSCApprovers = [];

   // Code to run in the form OnLoad event (This does nothing)
    this.formOnLoad = function (executionContext) {

   // Code to run in the attribute OnChange event
   this.attributeOnChange = function (executionContext) {
        var formContext = executionContext.getFormContext();

        //Getting current value of company selected to get other values associated with company
        var companyName = formContext.getAttribute("cr866_ab_company").getValue()[0];
        //Sets notification saying company is working (may want to review and see if we even want this)
        formContext.ui.setFormNotification("Company=" +, "INFO", myUniqueId); //change variable name
        window.setTimeout(function () { formContext.ui.clearFormNotification(myUniqueId); }, 5000);
        //Retrieves all instances of the records that have the name of the company selected
        Xrm.WebApi.retrieveMultipleRecords("cr866_ab_company", "?$select=_cr866_approver_value,_cr866_mdm_value,_cr866_sscapprover_value&$filter=cr866_name eq '" + + "'").then(
            function success(result) {
                // Stores each corresponding approver, MDM or SSC Approver into their appropriate array
                for (var i = 0; i < result.entities.length; i++) {
                // Setup listener for when approver is selected to trigger function corresponding to this
                var userControl = formContext.getControl("cr866_approver"); //change var name and code
                // Setup listener for when mdm is selected to trigger function corresponding to this
                userControl = formContext.getControl("cr866_mdm");
                // Setup listener for when ssc approver is selected to trigger function corresponding to this
                userControl = formContext.getControl("cr866_sscapproval");
            function (error) {
                // handle error conditions
    // function to handle custom filter for normal approver
    Sdk.userFilterApprover = function () {

        // intitiate filter
        var userFilter = "<filter type='or'>"
        // saw an issue where reusing original array was causing 'undefined' attribute this also only allows unique values
        var arrayOfApprovers1 = arrayOfApprovers.filter(onlyUnique);
        // this checks for any null values and eliminates them
        arrayOfApprovers1 = arrayOfApprovers1.filter(n => n);
        // loop through each guid and develop filter around it
        for (var i = 0; i < arrayOfApprovers1.length; i++) {
                    userFilter = userFilter + "<condition attribute='systemuserid' operator='eq' value='" + arrayOfApprovers1[i] + "'/>";
        // close filter via syntax
        var userFilter = userFilter + "</filter>"
        // initialize formContext
         var formContext = Xrm.Page.getControl("cr866_ab_company").formContext;
        // adding custom filter

    // function to handle custom filter for MDM
    Sdk.userFilterMDM = function () {

        // intitiate filter
        var userFilter = "<filter type='or'>"
        // saw an issue where reusing original array was causing 'undefined' attribute this also only allows unique values
        var arrayOfMDMs1 = arrayOfMDMs.filter(onlyUnique);
        // this checks for any null values and eliminates them
        arrayOfMDMs1 = arrayOfMDMs1.filter(n => n);
        // loop through each guid and develop filter around it
        for (var i = 0; i < arrayOfMDMs1.length; i++) {
                    userFilter = userFilter + "<condition attribute='systemuserid' operator='eq' value='" + arrayOfMDMs1[i] + "'/>";
        // close filter via syntax
        var userFilter = userFilter + "</filter>"
        // initialize formContext
        var formContext = Xrm.Page.getControl("cr866_ab_company").formContext;
        // adding custom filter

    // function to handle custom filter for SSC Approver
    Sdk.userFilterSSC = function () {
        // intitiate filter
        var userFilter = "<filter type='or'>"
        // saw an issue where reusing original array was causing 'undefined' attribute this also only allows unique values
        var arrayOfSSCApprovers1 = arrayOfSSCApprovers.filter(onlyUnique);
        // this checks for any null values and eliminates them
        arrayOfSSCApprovers1 = arrayOfSSCApprovers1.filter(n => n);
        // loop through each guid and develop filter around it
        for (var i = 0; i < arrayOfSSCApprovers1.length; i++) {
                    userFilter = userFilter + "<condition attribute='systemuserid' operator='eq' value='" + arrayOfSSCApprovers1[i] + "'/>";
        // close filter via syntax
        var userFilter = userFilter + "</filter>"
        // initialize form context
        var formContext = Xrm.Page.getControl("cr866_ab_company").formContext;
        // adding custom filter

   // Code to run in the form OnSave event
    this.formOnSave = function () {


Just as another frame of reference, the event occurs in the first Lookup field for "Company" under "attributeOnChange".


It looks like this:



Any help is greatly appreciated. Thank-you.


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