diff --git a/app/Http/Controllers/Business/CourierAgreementSignatures.php b/app/Http/Controllers/Business/CourierAgreementSignatures.php
index 27344cf8..6dcb16d8 100644
--- a/app/Http/Controllers/Business/CourierAgreementSignatures.php
+++ b/app/Http/Controllers/Business/CourierAgreementSignatures.php
@@ -41,7 +41,7 @@ class CourierAgreementSignatures extends Controller
         $request->validate(['partner_type' => ['required', 'in:courier,supplier']]);
         if ($request->input('partner_type') === 'supplier') {
             $request->validate(['supplier_id' => ['required', 'integer', 'min:1'],
-                'document_type' => ['required', 'in:account-proof,account-change,entity-change']]);
+                'document_type' => ['required', 'in:account-proof,account-change,entity-change,cooperation-contract,authorization']]);
             $supplier = app(\Modules\EcommerceFinance\Repositories\SupplierManagementMirrorRepository::class)
                 ->signingSupplier((int) $request->input('supplier_id'));
             if (! $supplier) throw ValidationException::withMessages(['supplier_id' => '供应商资料暂不可用，请重新选择供应商。']);
diff --git a/resources/views/business/pages/courier-payables/agreement-signing.blade.php b/resources/views/business/pages/courier-payables/agreement-signing.blade.php
index e353836c..4809ad90 100644
--- a/resources/views/business/pages/courier-payables/agreement-signing.blade.php
+++ b/resources/views/business/pages/courier-payables/agreement-signing.blade.php
@@ -2763,7 +2763,7 @@
                     secondaryOperatorInput.value = '';
                     root.querySelector('[data-request-error]').textContent = '';
                     supplierIdInput.value = '';
-                    ['former_company_name'].forEach(function (name) {
+                    ['former_company_name', 'cooperation_party_b_name', 'principal_name'].forEach(function (name) {
                         var input = form.querySelector('[name="' + name + '"]');
                         if (input) input.value = '';
                     });
@@ -2876,8 +2876,10 @@
                         delete esignAccountInput.dataset.autoFilled;
                         accountOrganizationInput.value = supplier ? supplier.company : '';
                         operatorNameInput.value = supplier ? supplier.operator : '';
-                        var formerCompany = form.querySelector('[name="former_company_name"]');
-                        if (formerCompany) formerCompany.value = supplier ? supplier.company : '';
+                        ['former_company_name', 'cooperation_party_b_name', 'principal_name'].forEach(function (name) {
+                            var input = form.querySelector('[name="' + name + '"]');
+                            if (input) input.value = supplier ? supplier.company : '';
+                        });
                     }
                     supplierControl.textContent = supplier
                         ? supplier.value + ' · ' + supplier.code + (supplier.company ? ' · ' + supplier.company : '') + (supplier.account ? '' : '；未维护易签宝账号，请手工填写并核对。')
diff --git a/tests/Feature/Business/CourierAgreementSignatureWorkflowTest.php b/tests/Feature/Business/CourierAgreementSignatureWorkflowTest.php
index c0a88fdd..8e64b2b5 100644
--- a/tests/Feature/Business/CourierAgreementSignatureWorkflowTest.php
+++ b/tests/Feature/Business/CourierAgreementSignatureWorkflowTest.php
@@ -128,6 +128,26 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
         Http::assertNothingSent();
     }
 
+    public function test_supplier_cooperation_contract_keeps_both_signing_parties(): void
+    {
+        $this->fakeEsign();
+        $repository = Mockery::mock(SupplierManagementMirrorRepository::class);
+        $repository->shouldReceive('signingSupplier')->with(7)->once()->andReturn((object) [
+            'Id' => 7, 'scmname' => '测试供应商', 'accountbankno' => '13900139000',
+        ]);
+        $this->app->instance(SupplierManagementMirrorRepository::class, $repository);
+        $payload = $this->cooperationContractPayload('supplier-cooperation');
+        $payload['partner_type'] = 'supplier';
+        $payload['supplier_id'] = 7;
+        unset($payload['esign_account']);
+        $this->loginAs()->post(route('business.courier-agreement-signatures.store'), $payload)->assertRedirect();
+        $signature = CourierAgreementSignature::query()->firstOrFail();
+        $this->assertSame('测试供应商', $signature->courier_name);
+        $this->assertSame('13900139000', $signature->operator_account);
+        $this->assertSame('18052733960', $signature->payload['secondary_esign_account']);
+        $this->assertSame(CourierAgreementSignature::STATUS_SIGNING, $signature->status);
+    }
+
     public function test_unknown_partner_type_is_rejected_before_sending(): void
     {
         Http::preventStrayRequests();