diff --git a/ui/src/views/form/FormDevExpress.tsx b/ui/src/views/form/FormDevExpress.tsx
index 716c8c46..f309888f 100644
--- a/ui/src/views/form/FormDevExpress.tsx
+++ b/ui/src/views/form/FormDevExpress.tsx
@@ -24,20 +24,61 @@ const FormDevExpress = (props: {
   const { listFormCode, isSubForm, mode, refForm, formData, formItems, setFormData } = props
 
   const formDataRef = useRef(formData)
+  const formItemsRef = useRef(formItems)
+  
   useEffect(() => {
     formDataRef.current = formData
   }, [formData])
 
+  useEffect(() => {
+    formItemsRef.current = formItems
+  }, [formItems])
+
+  // formItems değiştiğinde (özellikle cascading alanlar için) editörlerin dataSource'larını güncelle
+  useEffect(() => {
+    if (!refForm.current?.instance) return
+
+    const allItems = formItems.flatMap((group) => (group.items as SimpleItemWithColData[]) || [])
+    
+    allItems.forEach((item) => {
+      if (item.colData?.lookupDto?.dataSourceType && item.editorOptions?.dataSource) {
+        try {
+          const editor = refForm.current?.instance.getEditor(item.dataField!)
+          if (editor) {
+            editor.option('dataSource', item.editorOptions.dataSource)
+          }
+        } catch (err) {
+          // Editor henüz oluşmamış olabilir, sessizce devam et
+          console.debug('Editor update skipped for', item.dataField, err)
+        }
+      }
+    })
+  }, [formItems])
+
   return (
     <form className={`${DX_CLASSNAMES} ${!isSubForm ? 'px-2' : ''} pb-2`}>
       <FormDx
         ref={refForm}
         formData={formData}
         onFieldDataChanged={async (e: FieldDataChangedEvent) => {
-          setFormData({ ...formData, [e.dataField!]: e.value })
+          const newFormData = { ...formData, [e.dataField!]: e.value }
+          
+          // Cascading child field'leri temizle (parent field değiştiğinde)
+          const allItems = formItemsRef.current.flatMap((group) => (group.items as SimpleItemWithColData[]) || [])
+          const cascadingChildren = allItems.filter((item) => {
+            const parentFields = item.colData?.lookupDto?.cascadeParentFields?.split(',') || []
+            return parentFields.some(field => field.trim() === e.dataField)
+          })
+
+          // Parent field değiştiğinde child field'leri temizle
+          cascadingChildren.forEach((child) => {
+            newFormData[child.dataField!] = null
+          })
+
+          setFormData(newFormData)
 
           //Dinamik script
-          const changeItem = formItems
+          const changeItem = formItemsRef.current
             .flatMap((group) => (group.items as SimpleItemWithColData[]) || [])
             .find((i: SimpleItemWithColData) => i.dataField === e.dataField)
 
diff --git a/ui/src/views/form/useFormData.tsx b/ui/src/views/form/useFormData.tsx
index 29cef6b6..0cd4cc8d 100644
--- a/ui/src/views/form/useFormData.tsx
+++ b/ui/src/views/form/useFormData.tsx
@@ -295,10 +295,11 @@ const useGridData = (props: {
 
   // formData değiştiğinde sadece lookup datasource'ları güncelle
   useEffect(() => {
-    if (!gridDto || !formData || !formItems.length) {
+    if (!gridDto || !formItems.length) {
       return
     }
 
+    // View mode'da formData olsa da olmasa da cascading alanlar için dataSource oluşturulmalı
     const updatedItems = formItems.map((groupItem) => ({
       ...groupItem,
       items: (groupItem.items as SimpleItemWithColData[])?.map((item) => {
@@ -308,7 +309,8 @@ const useGridData = (props: {
             ...item,
             editorOptions: {
               ...item.editorOptions,
-              dataSource: getLookupDataSource(colData?.editorOptions, colData, formData),
+              // formData null bile olsa getLookupDataSource çağrılmalı (null parametrelerle API çağrısı yapılacak)
+              dataSource: getLookupDataSource(colData?.editorOptions, colData, formData || null),
               valueExpr: colData?.lookupDto?.valueExpr?.toLowerCase(),
               displayExpr: colData?.lookupDto?.displayExpr?.toLowerCase(),
             },
@@ -319,7 +321,7 @@ const useGridData = (props: {
     }))
 
     setFormItems(updatedItems)
-  }, [formData])
+  }, [formData, gridDto])
 
   useEffect(() => {
     if (!gridReady) {
diff --git a/ui/src/views/form/useLookupDataSource.ts b/ui/src/views/form/useLookupDataSource.ts
index d1a6bcab..31191df8 100644
--- a/ui/src/views/form/useLookupDataSource.ts
+++ b/ui/src/views/form/useLookupDataSource.ts
@@ -138,16 +138,13 @@ export const useLookupDataSource = ({
       const { lookupDto } = colData
       const filters: any[] = []
 
-      // Eğer cascadeParentFields varsa ve row verisi (data) yoksa boş döneriz
-      if (lookupDto.cascadeParentFields && !data) {
-        return { store: [] }
-      }
+      // Cascading field'ler için - data yoksa veya parent field değeri yoksa null parametreler ile API çağrısı yap
       if (lookupDto.cascadeParentFields) {
         if (lookupDto.dataSourceType == UiLookupDataSourceTypeEnum.StaticData) {
           filters.push([
             lookupDto?.cascadeRelationField,
             lookupDto?.cascadeFilterOperator,
-            options?.data[lookupDto?.cascadeParentField],
+            options?.data?.[lookupDto?.cascadeParentField] ?? null,
           ])
         } else {
           for (const cascadeParentField of lookupDto.cascadeParentFields.split(',')) {