fix rate issue

apps/edr-freight-api/src/modules/contracts/contract-pricing.lane-scope.spec.ts

@@ -71,6 +71,36 @@ describe('contract base freight is priced on the contract lane only', () => {
     ).rejects.toThrow(UnprocessableEntityException);
   });
 
+  it('freezes the OVERWEIGHT_PER_TON surcharge on export contracts only', async () => {
+    const overweight = rate({
+      rateType: 'OVERWEIGHT_PER_TON',
+      trigger: 'OVERWEIGHT',
+      rateUnit: 'PER_TON',
+      rateValue: 25,
+      originYardId: null,
+      destinationYardId: null,
+    } as Partial<Rate>);
+
+    const exported = await service([
+      rate({ rateType: 'CONTAINER_EXPORT', containerTypeId: CT20, rateValue: 900 }),
+      overweight,
+    ]).buildBreakdown(contract({ tradeDirection: 'EXPORT' }));
+    expect(exported.lineItems).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ code: 'OVERWEIGHT_PER_TON', unitPrice: 25 }),
+      ]),
+    );
+
+    // Import derives overweight from the route's base freight — never frozen.
+    const imported = await service([
+      rate({ containerTypeId: CT20, rateValue: 750 }),
+      overweight,
+    ]).buildBreakdown(contract({}));
+    expect(
+      imported.lineItems.some((li) => li.code === 'OVERWEIGHT_PER_TON'),
+    ).toBe(false);
+  });
+
   it('blocks bulk contracts too instead of borrowing an arbitrary rate', async () => {
     const bulk = contract({ freightType: 'BULK', cargoScope: [] });
     await expect(

apps/edr-freight-api/src/modules/contracts/contract-pricing.service.ts

@@ -219,6 +219,26 @@ export class ContractPricingService {
         });
       }
     }
+    // Overweight surcharge — EXPORT contracts freeze the OVERWEIGHT_PER_TON
+    // rate so booking pricing bills the contract's price on excess tons
+    // (frozenRateByCode wins over the live rate). Always included, no toggle:
+    // overweight is system-detected at booking, never customer-opted. IMPORT
+    // never reads this snapshot — its overweight price derives from the
+    // route's base container freight (see RuleEngineService).
+    if (contract.tradeDirection === 'EXPORT') {
+      const overweight = liveRates.find(
+        (r) => r.trigger === 'OVERWEIGHT' && r.currency === 'USD',
+      );
+      if (overweight && Number(overweight.rateValue) > 0) {
+        lineItems.push({
+          code: 'OVERWEIGHT_PER_TON',
+          label: 'Overweight surcharge (per excess ton)',
+          unit: toContractUnit(overweight.rateUnit),
+          unitPrice: convert(Number(overweight.rateValue)),
+          conditionalOn: 'is_overweight',
+        });
+      }
+    }
     // Lashing / cargo securing — BULK only, shown when the contract's commodity
     // needs lashing (cargoType.hasLashing). The commodity-scoped rate for the
     // contract's direction wins over the commodity-wide catch-all; billed at