diff --git a/frontend/src/lib/components/dashboard/invoices/edit/save-invoice.ts b/frontend/src/lib/components/dashboard/invoices/edit/save-invoice.ts
index 03982769..e6f6b550 100644
--- a/frontend/src/lib/components/dashboard/invoices/edit/save-invoice.ts
+++ b/frontend/src/lib/components/dashboard/invoices/edit/save-invoice.ts
@@ -110,9 +110,7 @@ function buildInvoicePayload(formData: FormDataSet): CreateInvoiceData | UpdateI
 	const payload: any = {
 		// Datos generales desde InvoiceTopFieldsFormData
 		system: 'fixed_asset',
-		operation_type: InvoiceTopFieldsFormData?.operation_type !== null && InvoiceTopFieldsFormData?.operation_type !== undefined
-			? (InvoiceTopFieldsFormData.operation_type === 1 ? 'exp' : 'imp') as OperationType
-			: undefined,
+		operation_type: InvoiceTopFieldsFormData?.operation_type || undefined,
 		invoice_type: InvoiceTopFieldsFormData?.invoice_type || undefined,
 		document_type: generalFormData?.document_type || undefined,
 		invoice_number: InvoiceTopFieldsFormData?.invoice_number || undefined,
diff --git a/frontend/src/routes/dashboard/invoices/+page.svelte b/frontend/src/routes/dashboard/invoices/+page.svelte
index 06086755..61138a73 100644
--- a/frontend/src/routes/dashboard/invoices/+page.svelte
+++ b/frontend/src/routes/dashboard/invoices/+page.svelte
@@ -427,11 +427,6 @@
 
     function handleCreateClick() {
         const params = new URLSearchParams(window.location.search);
-        const operationType = params.get('operation_type');
-        if (operationType) {
-            const operationTypeNumber = operationType === 'exp' ? 1 : 2;
-            params.set('operation_type', operationTypeNumber.toString());
-        }
         
         const queryString = params.toString();
         const url = queryString 
diff --git a/frontend/src/routes/dashboard/invoices/edit/[id]/+page.server.ts b/frontend/src/routes/dashboard/invoices/edit/[id]/+page.server.ts
index 2ec29c64..78a4d101 100644
--- a/frontend/src/routes/dashboard/invoices/edit/[id]/+page.server.ts
+++ b/frontend/src/routes/dashboard/invoices/edit/[id]/+page.server.ts
@@ -20,13 +20,10 @@ export const load: PageServerLoad = async ({ params, cookies, fetch, url }) => {
 	const operationTypeParam = url.searchParams.get('operation_type');
 	const invoiceTypeParam = url.searchParams.get('invoice_type');
 
-	// Parsear operation_type de forma segura
-	let parsedOperationType: number | null = null;
-	if (operationTypeParam) {
-		const parsed = parseInt(operationTypeParam, 10);
-		if (!isNaN(parsed)) {
-			parsedOperationType = parsed;
-		}
+	// Validar que operation_type sea 'exp' o 'imp'
+	let parsedOperationType: string | null = null;
+	if (operationTypeParam && (operationTypeParam === 'exp' || operationTypeParam === 'imp')) {
+		parsedOperationType = operationTypeParam;
 	}
 
 	// Cargar datos de referencia necesarios