diff --git a/src/process/validation/rules/__tests__/validateAvailableItems.test.ts b/src/process/validation/rules/__tests__/validateAvailableItems.test.ts
index 9f0251c6..cc5beaba 100644
--- a/src/process/validation/rules/__tests__/validateAvailableItems.test.ts
+++ b/src/process/validation/rules/__tests__/validateAvailableItems.test.ts
@@ -457,3 +457,105 @@ it('Validating a simple JSON select component (nested actual JSON with valueProp
     const result = await validateAvailableItems(context);
     expect(result).to.equal(null);
 });
+
+it('Validating a simple radio component with url data source with the available items validation parameter will return null if the item is valid', async () => {
+    const component: RadioComponent = {
+        ...simpleRadioField,
+        dataSrc: 'url',
+        data: {
+            url: 'http://localhost:8080/numbers',
+            headers: [],
+        },
+        validate: { onlyAvailableItems: true },
+    };
+    const data = {
+        component: '2',
+    };
+    
+    const context = generateProcessorContext(component, data);
+    context.fetch = (url: string, options?: RequestInit | undefined) => {
+        return Promise.resolve({
+            ok: true,
+            json: () => Promise.resolve(['1', '2', '3'])
+        });
+    };
+    const result = await validateAvailableItems(context);
+    expect(result).to.equal(null);
+});
+
+it('Validating a simple radio component with url data source with the available items validation parameter will return FieldError if the item is invalid', async () => {
+    const component: RadioComponent = {
+        ...simpleRadioField,
+        dataSrc: 'url',
+        data: {
+            url: 'http://localhost:8080/numbers',
+            headers: [],
+        },
+        validate: { onlyAvailableItems: true },
+    };
+    const data = {
+        component: '4',
+    };
+    
+    const context = generateProcessorContext(component, data);
+    context.fetch = (url: string, options?: RequestInit | undefined) => {
+        return Promise.resolve({
+            ok: true,
+            json: () => Promise.resolve(['1', '2', '3'])
+        });
+    };
+    const result = await validateAvailableItems(context);
+    expect(result).to.be.instanceOf(FieldError);
+    expect(result?.errorKeyOrMessage).to.equal('invalidOption');
+});
+
+it('Validating a simple select component with url data source with the available items validation parameter will return null if the item is valid', async () => {
+    const component: SelectComponent = {
+        ...simpleSelectOptions,
+        dataSrc: 'url',
+        data: {
+            url: 'http://localhost:8080/numbers',
+            headers: [],
+        },
+        validate: { onlyAvailableItems: true },
+    };
+    const data = {
+        component: {'id': 'opt_1', 'value': 1},
+    };
+    
+    const context = generateProcessorContext(component, data);
+    context.fetch = (url: string, options?: RequestInit | undefined) => {
+        return Promise.resolve({
+            ok: true,
+            json: () => Promise.resolve([{'id': 'opt_1', 'value': 1}, {'id': 'opt_2', 'value': 2}])
+        });
+    };
+    const result = await validateAvailableItems(context);
+    expect(result).to.equal(null);
+});
+
+it('Validating a simple select component with url data source with the available items validation parameter will return FieldError if the item is invalid', async () => {
+    const component: SelectComponent = {
+        ...simpleSelectOptions,
+        dataSrc: 'url',
+        data: {
+            url: 'http://localhost:8080/numbers',
+            headers: [],
+        },
+        validate: { onlyAvailableItems: true },
+    };
+    const data = {
+        component: {'id': 'opt_3', 'value': 3},
+    };
+    
+    const context = generateProcessorContext(component, data);
+    context.fetch = (url: string, options?: RequestInit | undefined) => {
+        return Promise.resolve({
+            ok: true,
+            json: () => Promise.resolve([{'id': 'opt_1', 'value': 1}, {'id': 'opt_2', 'value': 2}])
+        });
+    };
+    const result = await validateAvailableItems(context);
+    expect(result).to.be.instanceOf(FieldError);
+    expect(result?.errorKeyOrMessage).to.equal('invalidOption');
+});
\ No newline at end of file
diff --git a/src/process/validation/rules/asynchronousRules.ts b/src/process/validation/rules/asynchronousRules.ts
index 4c0703d4..4b2fc2c8 100644
--- a/src/process/validation/rules/asynchronousRules.ts
+++ b/src/process/validation/rules/asynchronousRules.ts
@@ -1,7 +1,9 @@
 import { ValidationRuleInfo } from "types";
 import { validateUrlSelectValueInfo } from "./validateUrlSelectValue";
+import { validateAvailableItemsInfo } from "./validateAvailableItems";
 
 // These are the validations that are asynchronouse (e.g. require fetch
 export const asynchronousRules: ValidationRuleInfo[] = [
     validateUrlSelectValueInfo,
+    validateAvailableItemsInfo
 ];
diff --git a/src/process/validation/rules/validateAvailableItems.ts b/src/process/validation/rules/validateAvailableItems.ts
index 5cad15c3..64c361b9 100644
--- a/src/process/validation/rules/validateAvailableItems.ts
+++ b/src/process/validation/rules/validateAvailableItems.ts
@@ -1,16 +1,16 @@
 import { isEmpty, isUndefined} from 'lodash';
 import { FieldError, ProcessorError } from 'error';
 import { Evaluator } from 'utils';
-import { RadioComponent, SelectComponent, RuleFn, RuleFnSync, ValidationContext } from 'types';
+import { RadioComponent, SelectComponent, RuleFn, RuleFnSync, ValidationContext, FetchFn, SelectBoxesComponent } from 'types';
 import { isObject, isPromise } from '../util';
 import { ProcessorInfo } from 'types/process/ProcessorInfo';
+import { getErrorMessage } from 'utils/error';
 
 function isValidatableRadioComponent(component: any): component is RadioComponent {
     return (
         component &&
         component.type === 'radio' &&
-        !!component.validate?.onlyAvailableItems &&
-        component.dataSrc === 'values'
+        !!component.validate?.onlyAvailableItems
     );
 }
 
@@ -23,6 +23,15 @@ function isValidateableSelectComponent(component: any): component is SelectCompo
     );
 }
 
+function isValidateableSelectBoxesComponent(component: any): component is SelectBoxesComponent {
+    return (
+        component &&
+        !!component.validate?.onlyAvailableItems &&
+        component.type === 'selectboxes' &&
+        component.dataSrc === 'url'
+    );
+}
+
 function mapDynamicValues<T extends Record<string, any>>(component: SelectComponent, values: T[]) {
     return values.map((value) => {
         if (component.valueProperty) {
@@ -36,6 +45,29 @@ function mapStaticValues(values: { label: string; value: string }[]) {
     return values.map((obj) => obj.value);
 }
 
+const getAvailableDynamicValues = async (component: any, context: ValidationContext) => {
+    let _fetch: FetchFn | null = null;
+    try {
+        _fetch = context.fetch ? context.fetch : fetch;
+    }
+    catch (err) {
+        _fetch = null;
+    }
+    try {
+        if (!_fetch) {
+            console.log('You must provide a fetch interface to the fetch processor.');
+            return null;
+        }
+        const response = await _fetch((component as any).data.url, { method: 'GET' });
+        const data = await response.json();
+        return data ? mapDynamicValues(component, data) : null;
+    } 
+    catch (err) {
+        console.error(getErrorMessage(err));
+        return null;
+    }
+}
+
 async function getAvailableSelectValues(component: SelectComponent, context: ValidationContext) {
     if (isUndefined(component.dataSrc) && component.data.hasOwnProperty('values')) {
         component.dataSrc = 'values';
@@ -100,6 +132,8 @@ async function getAvailableSelectValues(component: SelectComponent, context: Val
                     'validate:validateAvailableItems'
                 );
             }
+        case 'url':
+            return await getAvailableDynamicValues(component, context);
         default:
             throw new ProcessorError(
                 `Failed to validate available values in select component '${component.key}': data source ${component.dataSrc} is not valid}`,
@@ -196,11 +230,15 @@ export const validateAvailableItems: RuleFn = async (context: ValidationContext)
                 return null;
             }
 
-            const values = component.values;
+            const values = component.dataSrc === 'url' ? await getAvailableDynamicValues(component, context) : component.values;
             if (values) {
-                return values.findIndex(({ value: optionValue }) => optionValue === value) !== -1
-                    ? null
-                    : error;
+                if (isObject(value)) {
+                    return values.find((optionValue) => compareComplexValues(optionValue, value, context)) !==
+                        undefined
+                        ? null
+                        : error;
+                }
+                return values.find((optionValue) => optionValue === value) !== undefined ? null : error;
             }
 
             return null;
@@ -217,6 +255,21 @@ export const validateAvailableItems: RuleFn = async (context: ValidationContext)
                         : error;
                 }
 
+                return values.find((optionValue) => optionValue === value) !== undefined ? null : error;
+            }
+        } else if (isValidateableSelectBoxesComponent(component)) {
+            if (value == null || isEmpty(value)) {
+                return null;
+            }
+            const values = await getAvailableDynamicValues(component, context);
+            if (values) {
+                if (isObject(value)) {
+                    return values.find((optionValue) => compareComplexValues(optionValue, value, context)) !==
+                        undefined
+                        ? null
+                        : error;
+                }
+
                 return values.find((optionValue) => optionValue === value) !== undefined ? null : error;
             }
         }
@@ -237,6 +290,9 @@ export const shouldValidate = (context: any) => {
     if (isValidateableSelectComponent(component)) {
         return true;
     }
+    if (isValidateableSelectBoxesComponent(component)) {
+        return true;
+    }
     return false;
 }
 
@@ -247,7 +303,7 @@ export const validateAvailableItemsSync: RuleFnSync = (context: ValidationContex
         if (!shouldValidate(context)) {
             return null;
         }
-        if (isValidatableRadioComponent(component)) {
+        if (isValidatableRadioComponent(component) && component.dataSrc !== 'url') {
             const values = component.values;
             if (values) {
                 return values.findIndex(({ value: optionValue }) => optionValue === value) !== -1