diff --git a/docs/superpowers/plans/2026-06-09-issued-orders.md b/docs/superpowers/plans/2026-06-09-issued-orders.md
index 6e7ea97..81eb64c 100644
--- a/docs/superpowers/plans/2026-06-09-issued-orders.md
+++ b/docs/superpowers/plans/2026-06-09-issued-orders.md
@@ -224,12 +224,16 @@ describe("issued-order numbering", () => {
 
   it("release frees only the highest number", async () => {
     const year = new Date().getFullYear();
-    const a = await generateIssuedOrderNumber(year);
-    const b = await generateIssuedOrderNumber(year);
-    await releaseIssuedOrderNumber(year, b.number);
-    expect((await previewIssuedOrderNumber(year)).number).toBe(b.number);
-    await releaseIssuedOrderNumber(year, a.number); // not highest → no-op
-    expect((await previewIssuedOrderNumber(year)).number).toBe(b.number);
+    await generateIssuedOrderNumber(year); // seq 1
+    await generateIssuedOrderNumber(year); // seq 2
+    const c = await generateIssuedOrderNumber(year); // seq 3 (current highest)
+    const beforeRelease = (await previewIssuedOrderNumber(year)).number; // seq 4
+    // Releasing a number that is NOT the current highest is a no-op.
+    await releaseIssuedOrderNumber(year, "00000000");
+    expect((await previewIssuedOrderNumber(year)).number).toBe(beforeRelease);
+    // Releasing the current highest reclaims it.
+    await releaseIssuedOrderNumber(year, c.number);
+    expect((await previewIssuedOrderNumber(year)).number).toBe(c.number);
   });
 });
 ```
diff --git a/src/__tests__/issued-orders.test.ts b/src/__tests__/issued-orders.test.ts
new file mode 100644
index 0000000..cae0596
--- /dev/null
+++ b/src/__tests__/issued-orders.test.ts
@@ -0,0 +1,41 @@
+import { describe, it, expect, afterEach } from "vitest";
+import prisma from "../config/database";
+import {
+  generateIssuedOrderNumber,
+  previewIssuedOrderNumber,
+  releaseIssuedOrderNumber,
+} from "../services/numbering.service";
+
+afterEach(async () => {
+  await prisma.number_sequences.deleteMany({ where: { type: "issued_order" } });
+});
+
+describe("issued-order numbering", () => {
+  it("generates sequential numbers", async () => {
+    const year = new Date().getFullYear();
+    const a = await generateIssuedOrderNumber(year);
+    const b = await generateIssuedOrderNumber(year);
+    expect(Number(b.number)).toBe(Number(a.number) + 1);
+  });
+
+  it("preview does not consume the sequence", async () => {
+    const year = new Date().getFullYear();
+    const p1 = await previewIssuedOrderNumber(year);
+    const p2 = await previewIssuedOrderNumber(year);
+    expect(p1.number).toBe(p2.number);
+  });
+
+  it("release frees only the highest number", async () => {
+    const year = new Date().getFullYear();
+    await generateIssuedOrderNumber(year); // seq 1
+    await generateIssuedOrderNumber(year); // seq 2
+    const c = await generateIssuedOrderNumber(year); // seq 3 (current highest)
+    const beforeRelease = (await previewIssuedOrderNumber(year)).number; // seq 4
+    // Releasing a number that is NOT the current highest is a no-op.
+    await releaseIssuedOrderNumber(year, "00000000");
+    expect((await previewIssuedOrderNumber(year)).number).toBe(beforeRelease);
+    // Releasing the current highest reclaims it.
+    await releaseIssuedOrderNumber(year, c.number);
+    expect((await previewIssuedOrderNumber(year)).number).toBe(c.number);
+  });
+});
diff --git a/src/services/numbering.service.ts b/src/services/numbering.service.ts
index a59cdd0..d050b33 100644
--- a/src/services/numbering.service.ts
+++ b/src/services/numbering.service.ts
@@ -12,6 +12,7 @@ type TxClient = Omit<
 const DEFAULT_OFFER_PATTERN = "{YYYY}/{PREFIX}/{NNN}";
 const DEFAULT_ORDER_PATTERN = "{YY}{CODE}{NNNN}";
 const DEFAULT_INVOICE_PATTERN = "{YY}{CODE}{NNNN}";
+const DEFAULT_ISSUED_ORDER_PATTERN = "{YY}{CODE}{NNNN}";
 
 /**
  * Apply a numbering pattern template.
@@ -43,6 +44,8 @@ async function getSettings() {
       offer_number_pattern: true,
       order_number_pattern: true,
       invoice_number_pattern: true,
+      issued_order_number_pattern: true,
+      issued_order_type_code: true,
     },
   });
 }
@@ -150,13 +153,18 @@ async function releaseSequence(
       ? settings?.order_number_pattern || DEFAULT_ORDER_PATTERN
       : type === "invoice"
         ? settings?.invoice_number_pattern || DEFAULT_INVOICE_PATTERN
-        : settings?.offer_number_pattern || DEFAULT_OFFER_PATTERN;
+        : type === "issued_order"
+          ? settings?.issued_order_number_pattern ||
+            DEFAULT_ISSUED_ORDER_PATTERN
+          : settings?.offer_number_pattern || DEFAULT_OFFER_PATTERN;
   const code =
     type === "shared"
       ? settings?.order_type_code || "71"
       : type === "invoice"
         ? settings?.invoice_type_code || "81"
-        : "";
+        : type === "issued_order"
+          ? settings?.issued_order_type_code || "72"
+          : "";
   const prefix = type === "offer" ? settings?.quotation_prefix || "NA" : "";
 
   // Lock the sequence row for the duration of the decrement so a concurrent
@@ -205,6 +213,14 @@ async function isInvoiceNumberTaken(number: string): Promise<boolean> {
   return !!existing;
 }
 
+/** Verify an issued-order (PO) number is not already used. */
+async function isIssuedOrderNumberTaken(number: string): Promise<boolean> {
+  const existing = await prisma.issued_orders.findFirst({
+    where: { po_number: number },
+  });
+  return !!existing;
+}
+
 /** Verify an offer/quotation number is not already used. */
 export async function isOfferNumberTaken(number: string): Promise<boolean> {
   const existing = await prisma.quotations.findFirst({
@@ -355,6 +371,60 @@ export async function previewInvoiceNumber(
   return { number, next_number: number };
 }
 
+/**
+ * Next issued-order (PO) number (consumes sequence).
+ * Verifies uniqueness against the issued_orders table; retries if taken.
+ * Pass `tx` when calling inside an existing Prisma transaction.
+ */
+export async function generateIssuedOrderNumber(
+  _year?: number,
+  tx?: TxClient,
+): Promise<{ number: string; next_number: string }> {
+  const settings = await getSettings();
+  const pattern =
+    settings?.issued_order_number_pattern || DEFAULT_ISSUED_ORDER_PATTERN;
+  const code = settings?.issued_order_type_code || "72";
+  const year = _year || new Date().getFullYear();
+
+  for (let attempt = 0; attempt < 100; attempt++) {
+    const seq = await getNextSequence("issued_order", year, tx);
+    const number = applyPattern(pattern, { year, prefix: "", code, seq });
+    if (!(await isIssuedOrderNumberTaken(number))) {
+      return { number, next_number: number };
+    }
+  }
+  throw new Error("Nepodařilo se vygenerovat jedinečné číslo objednávky");
+}
+
+/**
+ * Preview next issued-order (PO) number (does NOT consume sequence).
+ */
+export async function previewIssuedOrderNumber(
+  _year?: number,
+): Promise<{ number: string; next_number: string }> {
+  const settings = await getSettings();
+  const pattern =
+    settings?.issued_order_number_pattern || DEFAULT_ISSUED_ORDER_PATTERN;
+  const code = settings?.issued_order_type_code || "72";
+  const year = _year || new Date().getFullYear();
+
+  const seq = await previewNextSequence("issued_order", year);
+  const number = applyPattern(pattern, { year, prefix: "", code, seq });
+  return { number, next_number: number };
+}
+
+/** Release an issued-order number back to the pool (decrement if highest). */
+export async function releaseIssuedOrderNumber(
+  year?: number,
+  deletedNumber?: string,
+) {
+  await releaseSequence(
+    "issued_order",
+    year || new Date().getFullYear(),
+    deletedNumber,
+  );
+}
+
 /** Release an offer number back to the pool (decrement if highest). */
 export async function releaseOfferNumber(
   year?: number,