diff --git a/modules/customer-invoices/src/api/application/issued-invoices/services/proforma-to-issued-invoice-props-converter.test.ts b/modules/customer-invoices/src/api/application/issued-invoices/services/proforma-to-issued-invoice-props-converter.test.ts
index da8b3da0..91d3fc41 100644
--- a/modules/customer-invoices/src/api/application/issued-invoices/services/proforma-to-issued-invoice-props-converter.test.ts
+++ b/modules/customer-invoices/src/api/application/issued-invoices/services/proforma-to-issued-invoice-props-converter.test.ts
@@ -2,7 +2,7 @@ import assert from "node:assert/strict";
 import test from "node:test";
 
 import { DiscountPercentage } from "@erp/core/api";
-import { UniqueID } from "@repo/rdx-ddd";
+import { CurrencyCode, LanguageCode, UniqueID, UtcDate } from "@repo/rdx-ddd";
 import { Maybe, Result } from "@repo/rdx-utils";
 
 import { ProformaToIssuedInvoiceConverter } from "./proforma-to-issued-invoice-props-converter";
@@ -68,3 +68,89 @@ test("toCreateProps no materializa VerifactuRecord ni policy en el converter", (
   assert.equal(result.isSuccess, true);
   assert.equal(result.data.verifactu.isNone(), true);
 });
+
+test("resolvePaymentTerm normaliza percentage.value cuando llega numérico del catálogo", () => {
+  const converter = new ProformaToIssuedInvoiceConverter();
+  const companyId = UniqueID.generateNewID();
+  const paymentTermId = UniqueID.generateNewID();
+  const invoiceDateResult = UtcDate.createFromISO("2026-08-20");
+  const languageCodeResult = LanguageCode.create("es");
+  const currencyCodeResult = CurrencyCode.create("EUR");
+  const discountResult = DiscountPercentage.create({ value: 0 });
+
+  assert.equal(invoiceDateResult.isSuccess, true);
+  assert.equal(languageCodeResult.isSuccess, true);
+  assert.equal(currencyCodeResult.isSuccess, true);
+  assert.equal(discountResult.isSuccess, true);
+
+  const result = converter["resolvePaymentTerm"]({
+    proforma: {
+      companyId,
+      id: UniqueID.generateNewID(),
+      targetInvoiceSeriesCode: Maybe.none(),
+      operationDate: Maybe.some(invoiceDateResult.data),
+      description: {
+        unwrap: () => "Servicio mensual",
+      },
+      languageCode: languageCodeResult.data,
+      currencyCode: currencyCodeResult.data,
+      notes: Maybe.none(),
+      reference: Maybe.none(),
+      customerId: UniqueID.generateNewID(),
+      totals: () => ({
+        subtotalAmount: {} as never,
+        itemsDiscountAmount: {} as never,
+        globalDiscountAmount: {} as never,
+        totalDiscountAmount: {} as never,
+        taxableAmount: {} as never,
+        ivaAmount: {} as never,
+        recAmount: {} as never,
+        retentionAmount: {} as never,
+        taxesAmount: {} as never,
+        totalAmount: {} as never,
+      }),
+      globalDiscountPercentage: discountResult.data,
+    } as never,
+    paymentMethod: {
+      id: UniqueID.generateNewID(),
+      name: "Transferencia",
+      description: Maybe.none(),
+    },
+    paymentTerm: Maybe.some({
+      id: paymentTermId.toPrimitive(),
+      name: "30 días",
+      description: "Pago estándar",
+      isActive: true,
+      dueRules: [
+        {
+          dueDays: "30",
+          percentage: {
+            value: 10000,
+            scale: 2,
+          },
+        },
+      ],
+    } as never),
+    taxRegime: {
+      code: "01",
+      description: "Régimen general",
+    },
+    fiscalClassification: {
+      operationQualificationCode: null,
+      exemptionReasonCode: null,
+    },
+    usesVerifactu: false,
+  });
+
+  assert.equal(result.isSuccess, true);
+  assert.equal(result.data.isSome(), true);
+  assert.deepEqual(result.data.unwrap().dueRules, [
+    {
+      dueDays: "30",
+      percentage: {
+        value: "10000",
+        scale: 2,
+      },
+    },
+  ]);
+});
diff --git a/modules/customer-invoices/src/api/application/issued-invoices/services/proforma-to-issued-invoice-props-converter.ts b/modules/customer-invoices/src/api/application/issued-invoices/services/proforma-to-issued-invoice-props-converter.ts
index d7f276f3..b2f960b1 100644
--- a/modules/customer-invoices/src/api/application/issued-invoices/services/proforma-to-issued-invoice-props-converter.ts
+++ b/modules/customer-invoices/src/api/application/issued-invoices/services/proforma-to-issued-invoice-props-converter.ts
@@ -306,7 +306,7 @@ export class ProformaToIssuedInvoiceConverter implements IProformaToIssuedInvoic
         dueRules: paymentTerm.dueRules.map((rule) => ({
           dueDays: rule.dueDays,
           percentage: {
-            value: rule.percentage.value,
+            value: String(rule.percentage.value),
             scale: rule.percentage.scale,
           },
         })),