fix(accounting): add missing Item fields to fix CI audit (#18)

Xero added QuantityAvailable and QuantityOnBackOrder to the Item schema.

Added both fields the same way as the existing
QuantityOnHand and TotalCostPool fields (read only numbers), and added
test coverage for them in ItemsTest.

Author: sudiptpa

src/Accounting/Item/Item.php

@@ -43,6 +43,10 @@ public function __construct(
 
     private int|float|null $quantityOnHand = null;
 
+    private int|float|null $quantityAvailable = null;
+
+    private int|float|null $quantityOnBackOrder = null;
+
     private int|float|null $totalCostPool = null;
 
     private ?string $statusAttributeString = null;
@@ -198,6 +202,30 @@ public function setQuantityOnHand(int|float|null $quantityOnHand): self
         return $this;
     }
 
+    public function getQuantityAvailable(): int|float|null
+    {
+        return $this->quantityAvailable;
+    }
+
+    public function setQuantityAvailable(int|float|null $quantityAvailable): self
+    {
+        $this->quantityAvailable = $quantityAvailable;
+
+        return $this;
+    }
+
+    public function getQuantityOnBackOrder(): int|float|null
+    {
+        return $this->quantityOnBackOrder;
+    }
+
+    public function setQuantityOnBackOrder(int|float|null $quantityOnBackOrder): self
+    {
+        $this->quantityOnBackOrder = $quantityOnBackOrder;
+
+        return $this;
+    }
+
     public function getTotalCostPool(): int|float|null
     {
         return $this->totalCostPool;
@@ -267,6 +295,8 @@ protected static function getDefinitions(): array
             'PurchaseDetails' => Field::object(Purchase::class),
             'SalesDetails' => Field::object(Purchase::class),
             'QuantityOnHand' => Field::number(),
+            'QuantityAvailable' => Field::number(),
+            'QuantityOnBackOrder' => Field::number(),
             'TotalCostPool' => Field::number(),
             'StatusAttributeString' => Field::string(),
             'UpdatedDateUTC' => Field::string(),

tests/Accounting/ItemsTest.php

@@ -47,6 +47,8 @@ public function test_it_can_query_and_find_items(): void
                     'TaxType' => 'OUTPUT2',
                 ],
                 'QuantityOnHand' => 15,
+                'QuantityAvailable' => 12,
+                'QuantityOnBackOrder' => 0,
                 'TotalCostPool' => 157.5,
                 'StatusAttributeString' => 'ERROR',
                 'UpdatedDateUTC' => '2026-04-01T01:00:00',
@@ -81,6 +83,8 @@ public function test_it_can_query_and_find_items(): void
         self::assertSame('200', $item->getSalesDetails()->getAccountCode());
         self::assertSame('OUTPUT2', $item->getSalesDetails()->getTaxType());
         self::assertSame(15, $item->getQuantityOnHand());
+        self::assertSame(12, $item->getQuantityAvailable());
+        self::assertSame(0, $item->getQuantityOnBackOrder());
         self::assertSame(157.5, $item->getTotalCostPool());
         self::assertSame('ERROR', $item->getStatusAttributeString());
         self::assertSame('2026-04-01T01:00:00', $item->getUpdatedDateUTC());