SDK.DependentOptionSet.filterDependentField = function(parentField, childField) {
    for ( var depOptionSet in SDK.DependentOptionSet.config) {
    var DependentOptionSet = SDK.DependentOptionSet.config[depOptionSet];
    /* Match the parameters to the correct dependent optionset mapping */
    if ((DependentOptionSet.parent == parentField) && (DependentOptionSet.dependent == childField)) {
        /* Get references to the related fields */
        var ParentField = Xrm.Page.data.entity.attributes.get(parentField);
        var ChildField = Xrm.Page.data.entity.attributes.get(childField);
        /* Capture the current value of the child field */
        var CurrentChildFieldValue = ChildField.getValue();

        /* If the parent field is null the Child field can be set to null */
        if (ParentField.getValue() == null) {
        ChildField.setValue(null);
        ChildField.setSubmitMode("always");
        ChildField.fireOnChange();

        // Any attribute may have any number of controls
        // So disable each instance
        var controls = ChildField.controls.get()

        for ( var ctrl in controls) {
            controls[ctrl].setDisabled(true);
        }
        return;
        }

        for ( var os in DependentOptionSet.options) {
        var Options = DependentOptionSet.options[os];
        var optionsToShow = Options.showOptions;
        /*
         * Find the Options that corresponds to the value of the parent
         * field.
         */
        if (ParentField.getValue() == Options.value) {
            var controls = ChildField.controls.get();
            /* Enable the field and set the options */
            for ( var ctrl in controls) {
            controls[ctrl].setDisabled(false);
            controls[ctrl].clearOptions();

            for ( var option in optionsToShow) {
                controls[ctrl].addOption(optionsToShow[option]);
            }

            }
            /* Check whether the current value is valid */
            var bCurrentValueIsValid = false;
            var ChildFieldOptions = optionsToShow;

            for ( var validOptionIndex in ChildFieldOptions) {
            var OptionDataValue = ChildFieldOptions[validOptionIndex].value;

            if (CurrentChildFieldValue == OptionDataValue) {
                bCurrentValueIsValid = true;
                break;
            }
            }
            /*
             * If the value is valid, set it. If not, set the child
             * field to null
             */
            if (bCurrentValueIsValid) {
            ChildField.setValue(CurrentChildFieldValue);
            } else {
            ChildField.setValue(null);
            }
            ChildField.setSubmitMode("always");
            ChildField.fireOnChange();
            break;
        }
        }

    }
    }
};