diff --git a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/packages-section.svelte b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/packages-section.svelte
index 3f87d585..51111592 100644
--- a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/packages-section.svelte
+++ b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/packages-section.svelte
@@ -125,6 +125,8 @@
 			customs.advalorem_american = fraction.ad_valorem;
 		}
 	}
+
+	const isPackageRequired = $derived(!!quantities.package_id || (Number(quantities.package_quantity) > 0));
 </script>
 
 <fieldset class="border rounded-md p-2 space-y-2">
@@ -135,12 +137,18 @@
 	
 	<div class="grid grid-cols-12 gap-2 items-end">
 		<div class="col-span-2 space-y-1">
-			<Label for="cantidad_bultos" class="text-xs">{m['invoice_item_fa.packages.quantity']()}: <span class="text-red-500">*</span></Label>
+			<Label for="cantidad_bultos" class="text-xs">
+				{m['invoice_item_fa.packages.quantity']()}: 
+				{#if isPackageRequired}<span class="text-red-500">*</span>{/if}
+			</Label>
 			<Input id="cantidad_bultos" type="number" step="1" min="0" bind:value={quantities.package_quantity} disabled={disabled} class="h-7 text-xs text-right" />
 		</div>
 
 		<div class="col-span-3 space-y-1">
-			<Label for="clave_bultos" class="text-xs">{m['invoice_item_fa.packages.package_code']()}: <span class="text-red-500">*</span></Label>
+			<Label for="clave_bultos" class="text-xs">
+				{m['invoice_item_fa.packages.package_code']()}: 
+				{#if isPackageRequired}<span class="text-red-500">*</span>{/if}
+			</Label>
 			<div class="flex gap-1">
 				<Input 
 					id="clave_bultos" 
diff --git a/frontend/src/lib/utils/items-logic.ts b/frontend/src/lib/utils/items-logic.ts
index f4caeb03..4feaa09c 100644
--- a/frontend/src/lib/utils/items-logic.ts
+++ b/frontend/src/lib/utils/items-logic.ts
@@ -316,13 +316,14 @@ function humanizeValidationMessage(message: string): string {
         .replace(/\b(value is not a valid integer)\b/gi, 'debe ser un número entero válido');
 }
 
-function formatFriendlyFieldMessage(fieldName: string, message: string, code?: string): string {
+function formatFriendlyFieldMessage(fieldName: string, message: string, code?: string, fieldPath?: string): string {
     const cleanFieldName = fieldName.replace(/^Partida \d+ - /, '');
-    const guidance = FIELD_GUIDANCE[cleanFieldName] || FIELD_GUIDANCE[fieldName];
+    // Try to find guidance using the technical fieldPath first, then the humanized name
+    const guidance = (fieldPath ? FIELD_GUIDANCE[fieldPath] : null) || FIELD_GUIDANCE[cleanFieldName] || FIELD_GUIDANCE[fieldName];
     const normalizedMessage = humanizeValidationMessage(message);
 
     if (code === 'REQUIRED' || code === 'REQUIRED_FIELD' || /es requerido|es obligatorio/i.test(normalizedMessage)) {
-        return guidance || `Completa ${fieldName}.`;
+        return guidance || `Es obligatorio.`;
     }
 
     if (code === 'AMERICAN_FRACTION_NOT_FOUND') {
@@ -376,8 +377,9 @@ export function formatItemError(error: any): string {
     // New structure (ApiResponse.validationErrors)
     if (status === 422 && Array.isArray(validationErrors)) {
         const errors = validationErrors.map((err: any) => {
-            const fieldName = humanizeFieldPath(err.field || '');
-            const msg = formatFriendlyFieldMessage(fieldName, err.message || 'error de validación', err.code);
+            const path = err.field || '';
+            const fieldName = humanizeFieldPath(path);
+            const msg = formatFriendlyFieldMessage(fieldName, err.message || 'error de validación', err.code, path.replace(/^line\[\d+\]\./, ''));
             
             return `• ${fieldName}: ${msg}`;
         });
@@ -393,7 +395,7 @@ export function formatItemError(error: any): string {
                 .join('.');
             
             const fieldName = humanizeFieldPath(locPath);
-            const msg = formatFriendlyFieldMessage(fieldName, err.msg || 'error de validación', err.type);
+            const msg = formatFriendlyFieldMessage(fieldName, err.msg || 'error de validación', err.type, locPath.replace(/^line\[\d+\]\./, ''));
             
             return `• ${fieldName}: ${msg}`;
         });