diff --git a/src/Framework/Framework/Resources/Scripts/tests/stateManagement.data.ts b/src/Framework/Framework/Resources/Scripts/tests/stateManagement.data.ts
index 95e55e9a48..32c04813a4 100644
--- a/src/Framework/Framework/Resources/Scripts/tests/stateManagement.data.ts
+++ b/src/Framework/Framework/Resources/Scripts/tests/stateManagement.data.ts
@@ -115,6 +115,16 @@ initDotvvm({
                 "C": 4,
                 "D": 8,
             }
+        },
+        tValidated: {
+            type: "object",
+            properties: {
+                RegexValidated: {
+                    validationRules: [
+                        { ruleName: "regularExpression", errorMessage: "Must have even length", parameters: ["^(..)+$"] }
+                    ]
+                }
+            }
         }
     }
 })
diff --git a/src/Framework/Framework/Resources/Scripts/tests/validation.test.ts b/src/Framework/Framework/Resources/Scripts/tests/validation.test.ts
index 1e11d688d4..f0226ba970 100644
--- a/src/Framework/Framework/Resources/Scripts/tests/validation.test.ts
+++ b/src/Framework/Framework/Resources/Scripts/tests/validation.test.ts
@@ -3,6 +3,12 @@ import { globalValidationObject as validation, ValidationErrorDescriptor } from
 import { createComplexObservableSubViewmodel, createComplexObservableViewmodel, ObservableHierarchy, ObservableSubHierarchy } from "./observableHierarchies"
 import { getErrors } from "../validation/error"
 import { setLogger } from "../utils/logging";
+import { runClientSideValidation } from '../validation/validation'
+import dotvvm from '../dotvvm-root'
+import { getStateManager } from "../dotvvm-base";
+import { StateManager } from "../state-manager";
+
+require("./stateManagement.data")
 
 
 describe("DotVVM.Validation - public API", () => {
@@ -319,6 +325,21 @@ describe("DotVVM.Validation - public API", () => {
     })
 });
 
+
+describe("DotVVM.Validation - view model validation", () => {
+    const s = getStateManager() as StateManager<any>
+    test("Validated object in dynamic", () => {
+        dotvvm.updateState(x => ({...x, Dynamic: { something: "abc", validatedObj: { $type: "tValidated", RegexValidated: "abcd" } } }))
+        s.doUpdateNow()
+        runClientSideValidation(s.stateObservable, {} as any)
+        expect(dotvvm.validation.errors).toHaveLength(0)
+        s.patchState({ Dynamic: { validatedObj: { RegexValidated: "abcde" }}})
+        s.doUpdateNow()
+        runClientSideValidation(s.stateObservable, {} as any)
+        expect(dotvvm.validation.errors).toHaveLength(1)
+    })
+})
+
 function SetupComplexObservableViewmodelWithErrorsOnProp1AndProp21() {
     validation.removeErrors("/");
     const vm = createComplexObservableViewmodel();
diff --git a/src/Framework/Framework/Resources/Scripts/validation/validation.ts b/src/Framework/Framework/Resources/Scripts/validation/validation.ts
index 6c62f2b541..64d707d909 100644
--- a/src/Framework/Framework/Resources/Scripts/validation/validation.ts
+++ b/src/Framework/Framework/Resources/Scripts/validation/validation.ts
@@ -66,7 +66,7 @@ const createValidationHandler = (pathFunction: (context: KnockoutBindingContext)
     }
 })
 
-const runClientSideValidation = (validationTarget: any, options: PostbackOptions) => {
+export const runClientSideValidation = (validationTarget: any, options: PostbackOptions) => {
 
     watchAndTriggerValidationErrorChanged(options,
         () => {
@@ -171,6 +171,9 @@ function validateViewModel(viewModel: any, path: string): void {
 }
 
 function validateRecursive(observable: KnockoutObservable<any>, propertyValue: any, type: TypeDefinition, propertyPath: string) {
+    if (compileConstants.debug && !ko.isObservable(observable)) {
+        throw Error(`Property ${propertyPath} isn't a knockout observable and cannot be validated.`)
+    }
     const lastSetError: CoerceResult = (observable as any)[lastSetErrorSymbol];
     if (lastSetError && lastSetError.isError) {
         ValidationError.attach(lastSetError.message, propertyPath, observable);
@@ -203,7 +206,7 @@ function validateRecursive(observable: KnockoutObservable<any>, propertyValue: a
                     validateViewModel(propertyValue, propertyPath);
                 } else {
                     for (const k of keys(propertyValue)) {
-                        validateRecursive(ko.unwrap(propertyValue[k]), propertyValue[k], { type: "dynamic" }, propertyPath + "/" + k);
+                        validateRecursive(propertyValue[k], ko.unwrap(propertyValue[k]), { type: "dynamic" }, propertyPath + "/" + k);
                     }
                 }
             }