diff --git a/backend/api/v1/modules/a76/items/imports/temporary/validators/create.py b/backend/api/v1/modules/a76/items/imports/temporary/validators/create.py
index d6080ac3..2507f953 100644
--- a/backend/api/v1/modules/a76/items/imports/temporary/validators/create.py
+++ b/backend/api/v1/modules/a76/items/imports/temporary/validators/create.py
@@ -33,14 +33,8 @@ def validate_create(
             code="REQUIRED"
         )
     
-    # 2. Validar part_number_id
-    if not line.part_number_id:
-        errors.add_error(
-            field="part_number_id",
-            message="Part Number ID es obligatorio",
-            solution="Selecciona un número de parte válido del catálogo",
-            code="REQUIRED"
-        )
+    # 2. Validar part_number_id (OPCIONAL - ya no es obligatorio)
+    # El campo part_number_id ahora es opcional
     
     # 3. Validar class_id
     if not line.class_id:
@@ -115,4 +109,22 @@ def validate_create(
             message="Description in Spanish es obligatorio",
             solution="Proporciona una descripción del item en español",
             code="REQUIRED"
+        )
+    
+    # 8. Validar customs.origin_country
+    if not line.customs or not line.customs.origin_country:
+        errors.add_error(
+            field="customs.origin_country",
+            message="País de Origen es obligatorio",
+            solution="Selecciona el país de origen del item",
+            code="REQUIRED"
+        )
+    
+    # 9. Validar customs.fraction_type
+    if not line.customs or not line.customs.fraction_type:
+        errors.add_error(
+            field="customs.fraction_type",
+            message="Tipo de Tarifa es obligatorio",
+            solution="Selecciona el tipo de tarifa (GENERAL, PROSEC, ALADI, TLCS)",
+            code="REQUIRED"
         )
\ No newline at end of file
diff --git a/backend/api/v1/modules/a76/items/imports/temporary/validators/update.py b/backend/api/v1/modules/a76/items/imports/temporary/validators/update.py
index 8feaa515..08aed895 100644
--- a/backend/api/v1/modules/a76/items/imports/temporary/validators/update.py
+++ b/backend/api/v1/modules/a76/items/imports/temporary/validators/update.py
@@ -138,14 +138,25 @@ def validate_update(
     
     # 8. Validar datos aduanales si se proporcionan
     if line.customs:
-        # Validar país de origen
-        if line.customs.origin_country is not None and not line.customs.origin_country:
-            errors.add_error(
-                field="customs.origin_country",
-                message="Origin Country no puede estar vacío",
-                solution="Selecciona el país de origen del item",
-                code="REQUIRED"
-            )
+        # Validar país de origen (OBLIGATORIO)
+        if line.customs.origin_country is not None:
+            if not line.customs.origin_country:
+                errors.add_error(
+                    field="customs.origin_country",
+                    message="País de Origen es obligatorio",
+                    solution="Selecciona el país de origen del item",
+                    code="REQUIRED"
+                )
+        
+        # Validar tipo de tarifa (OBLIGATORIO)
+        if line.customs.fraction_type is not None:
+            if not line.customs.fraction_type:
+                errors.add_error(
+                    field="customs.fraction_type",
+                    message="Tipo de Tarifa es obligatorio",
+                    solution="Selecciona el tipo de tarifa (GENERAL, PROSEC, ALADI, TLCS)",
+                    code="REQUIRED"
+                )
         
         # Validar preferencia arancelaria
         if line.customs.preference is not None and not line.customs.preference:
@@ -184,15 +195,16 @@ def validate_update(
                     code="INVALID_VALUE"
                 )
     
-    # 9. Validar descripción en español si se proporciona
+    # 9. Validar descripción en español (OBLIGATORIA)
     if line.description and hasattr(line.description, 'description_spanish'):
-        if line.description.description_spanish is not None and not line.description.description_spanish:
-            errors.add_error(
-                field="description.description_spanish",
-                message="La descripción en español no puede estar vacía",
-                solution="Proporciona una descripción del item en español",
-                code="REQUIRED"
-            )
+        if line.description.description_spanish is not None:
+            if not line.description.description_spanish.strip():
+                errors.add_error(
+                    field="description.description_spanish",
+                    message="Descripción en Español es obligatoria",
+                    solution="Proporciona una descripción del item en español",
+                    code="REQUIRED"
+                )
     
     # 10. Validar subpartidas si se actualizan
     if line.fa_data and line.fa_data.is_subitem:
diff --git a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-configuration.svelte b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-configuration.svelte
index 831d2739..e71c6096 100644
--- a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-configuration.svelte
+++ b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-configuration.svelte
@@ -87,7 +87,7 @@
 	<!-- Descriptions -->
 	<fieldset class="border rounded-md p-2 space-y-2">							
 		<div class="space-y-1">
-			<Label for="num_parte" class="text-xs">Número de Parte: <span class="text-red-500">*</span></Label>
+			<Label for="num_parte" class="text-xs">Número de Parte:</Label>
 			<div class="flex gap-1">
 				<Input 
 					id="num_parte" 
diff --git a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-sheet-fa.svelte b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-sheet-fa.svelte
index a091ac75..5bf87a1c 100644
--- a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-sheet-fa.svelte
+++ b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-sheet-fa.svelte
@@ -23,6 +23,7 @@
         editingItem = $bindable(),
         invoice,
         onSave,
+        onCancel,
         isSaving = false
     }: { 
         open: boolean;
@@ -30,6 +31,7 @@
         editingItem: Partial<Item>;
         invoice: Invoice | null;
         onSave: () => void;
+        onCancel?: () => void;
         isSaving?: boolean;
     } = $props();
 
@@ -55,7 +57,7 @@
                         </p>
                     </div>
                 </div>
-                <Button variant="ghost" size="icon" onclick={() => open = false} class="h-7 w-7 text-zinc-400 hover:text-zinc-600 dark:hover:text-zinc-200 hover:bg-zinc-100 dark:hover:bg-zinc-800">
+                <Button variant="ghost" size="icon" onclick={() => onCancel?.()} class="h-7 w-7 text-zinc-400 hover:text-zinc-600 dark:hover:text-zinc-200 hover:bg-zinc-100 dark:hover:bg-zinc-800">
                     <X class="w-3.5 h-3.5" />
                 </Button>
             </div>
@@ -164,7 +166,7 @@
 
         <footer class="bg-white dark:bg-zinc-950 border-t border-zinc-200 dark:border-zinc-800 px-3 py-1.5 shadow-sm shrink-0">
             <div class="flex items-center justify-end gap-1.5">
-                <Button variant="outline" size="sm" onclick={() => open = false} disabled={isSaving} class="h-7 text-xs px-2">
+                <Button variant="outline" size="sm" onclick={() => onCancel?.()} disabled={isSaving} class="h-7 text-xs px-2">
                     Cancelar
                 </Button>
                 <Button size="sm" onclick={onSave} disabled={isSaving} class="h-7 text-xs px-2 bg-blue-600 hover:bg-blue-700 dark:bg-blue-600 dark:hover:bg-blue-700 text-white">
diff --git a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/main-data.svelte b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/main-data.svelte
index 21e16369..5f59b1b4 100644
--- a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/main-data.svelte
+++ b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/main-data.svelte
@@ -252,6 +252,7 @@
 			<div class="space-y-1">
 				<Label for="tipo_tarifa" class="text-xs font-medium">Tariff Type: <span class="text-red-500">*</span></Label>
 				<select id="tipo_tarifa" bind:value={customs.fraction_type} class="flex h-8 w-auto min-w-[140px] rounded-md border border-input bg-background px-2 py-1 text-xs ring-offset-background">
+					<option value={undefined}>Selecciona...</option>
 					<option value="GENERAL">GENERAL</option>
 					<option value="PROSEC">PROSEC</option>
 					<option value="ALADI">ALADI</option>
diff --git a/frontend/src/lib/components/dashboard/invoices/edit/items/inv/item-sheet-inv.svelte b/frontend/src/lib/components/dashboard/invoices/edit/items/inv/item-sheet-inv.svelte
index 4b697771..237fd70e 100644
--- a/frontend/src/lib/components/dashboard/invoices/edit/items/inv/item-sheet-inv.svelte
+++ b/frontend/src/lib/components/dashboard/invoices/edit/items/inv/item-sheet-inv.svelte
@@ -14,6 +14,7 @@
 		editingItem = $bindable(),
 		invoice,
 		onSave,
+		onCancel,
 		isSaving = false
 	}: { 
 		open: boolean;
@@ -21,6 +22,7 @@
 		editingItem: Partial<Item>;
 		invoice: Invoice | null;
 		onSave: () => void;
+		onCancel?: () => void;
 		isSaving?: boolean;
 	} = $props();
 </script>
@@ -258,7 +260,7 @@
 		</Tabs.Root>
 
 		<Sheet.Footer class="mt-6 gap-2">
-			<Button variant="outline" onclick={() => open = false} disabled={isSaving}>
+			<Button variant="outline" onclick={() => onCancel?.()} disabled={isSaving}>
 				Cancelar
 			</Button>
 			<Button onclick={onSave} disabled={isSaving}>
diff --git a/frontend/src/lib/components/dashboard/invoices/edit/items/items-tab-form.svelte b/frontend/src/lib/components/dashboard/invoices/edit/items/items-tab-form.svelte
index afda3f78..7748eab7 100644
--- a/frontend/src/lib/components/dashboard/invoices/edit/items/items-tab-form.svelte
+++ b/frontend/src/lib/components/dashboard/invoices/edit/items/items-tab-form.svelte
@@ -53,6 +53,7 @@
 	let isEditMode = $state(false);
 	let showDeleteDialog = $state(false);
 	let selectedItem = $state<Item | null>(null);
+	let originalItemData = $state<Partial<Item> | null>(null); // Guardar estado original para cancelar
 	let editingItem = $state<Partial<Item>>({
 		invoice_id: undefined,
 		reference_number: '',
@@ -179,7 +180,7 @@
 				},
 				customs: {
 					fraction: undefined,
-					fraction_type: 'GENERAL',
+					fraction_type: undefined,
 					american_fraction: undefined,
 					origin_country: undefined,
 					destination_country: undefined,
@@ -211,7 +212,9 @@
 		isEditMode = true;
 		selectedItem = lineData.full_item;
 		// Deep clone and normalize numeric values
-		editingItem = normalizeItemData({ ...lineData.full_item });
+		editingItem = normalizeItemData(JSON.parse(JSON.stringify(lineData.full_item)));
+		// Guardar una copia del estado original para restaurar al cancelar
+		originalItemData = JSON.parse(JSON.stringify(editingItem));
 		// Enrich with descriptive data
 		enrichItemData(editingItem);
 		showItemSheet = true;
@@ -563,6 +566,65 @@
 	}
 
 	function saveItem() {
+		// Validar campos obligatorios antes de guardar
+		const line = editingItem.lines?.[0];
+		const missingFields: string[] = [];
+
+		if (!line) {
+			toast.warning('Error de datos', {
+				description: 'No se encontró información de la línea del item'
+			});
+			return;
+		}
+
+		// 1. Clase
+		if (!line.class_id) {
+			missingFields.push('Clase');
+		}
+
+		// 2. Cantidad
+		if (!line.quantity?.quantity || line.quantity.quantity <= 0) {
+			missingFields.push('Cantidad');
+		}
+
+		// 3. Unidad de Medida
+		if (!line.unit_of_measure) {
+			missingFields.push('U.M. (Unidad de Medida)');
+		}
+
+		// 4. Costo Unitario (al menos uno debe estar presente)
+		const hasCost = line.financial?.unit_cost_usd || 
+			line.financial?.unit_cost_mxn || 
+			line.financial?.unit_cost_capture;
+		if (!hasCost) {
+			missingFields.push('Costo Unitario (USD, MXN o Captura)');
+		}
+
+		// 5. País de Origen
+		if (!line.customs?.origin_country) {
+			missingFields.push('País de Origen');
+		}
+
+		// 6. Tipo de Tarifa
+		if (!line.customs?.fraction_type) {
+			missingFields.push('Tipo de Tarifa');
+		}
+
+		// 7. Descripción en Español
+		if (!line.description?.description_spanish?.trim()) {
+			missingFields.push('Descripción en Español');
+		}
+
+		if (missingFields.length > 0) {
+			const fieldsList = missingFields.join('\n• ');
+			toast.warning('Completa los campos obligatorios', {
+				description: `Faltan los siguientes campos:\n• ${fieldsList}`,
+				duration: 10000
+			});
+			return;
+		}
+
+		// Si pasa la validación, continuar con el guardado
 		if (isEditMode) {
 			saveEditedItem();
 		} else {
@@ -594,6 +656,15 @@
 			isSaving = false;
 		}
 	}
+
+	function handleCancelEdit() {
+		// Restaurar los datos originales si estamos editando
+		if (isEditMode && originalItemData) {
+			editingItem = JSON.parse(JSON.stringify(originalItemData));
+		}
+		// Cerrar el sheet
+		showItemSheet = false;
+	}
 </script>
 
 <div class="grid grid-cols-4 grid-rows-1 gap-3">
@@ -715,6 +786,7 @@
 		bind:editingItem={editingItem}
 		{invoice}
 		onSave={saveItem}
+		onCancel={handleCancelEdit}
 		{isSaving}
 	/>
 {:else}
@@ -724,6 +796,7 @@
 		bind:editingItem={editingItem}
 		{invoice}
 		onSave={saveItem}
+		onCancel={handleCancelEdit}
 		{isSaving}
 	/>
 {/if}