adds sfMemoData field to VaultDelete transaction

include/xrpl/protocol/detail/transactions.macro

@@ -868,6 +868,7 @@ TRANSACTION(ttVAULT_DELETE, 67, VaultDelete,
     mustDeleteAcct | destroyMPTIssuance | mustModifyVault,
     ({
     {sfVaultID, soeREQUIRED},
+    {sfData, soeOPTIONAL},
 }))
 
 /** This transaction trades assets for shares with a vault. */

src/test/app/Vault_test.cpp

@@ -4992,6 +4992,54 @@ class Vault_test : public beast::unit_test::suite
         }
     }
 
+    void
+    testVaultDeleteData()
+    {
+        using namespace test::jtx;
+
+        auto const test =
+            [&](std::string const& prefix, FeatureBitset features, std::string const& pl, TER expectedCode) {
+                Env env{*this, features};
+                testcase("VaultDelete data " + prefix);
+                Account const owner{"owner"};
+
+                Vault vault{env};
+                env.fund(XRP(1'000'000), owner);
+                env.close();
+
+                PrettyAsset const xrpAsset = xrpIssue();
+
+                auto const [tx, keylet] = vault.create({.owner = owner, .asset = xrpAsset});
+                env(tx, ter(tesSUCCESS), THISLINE);
+
+                auto delTx = vault.del({.owner = owner, .id = keylet.key});
+                env(delTx, data(pl), ter(expectedCode), THISLINE);
+
+                env.close();
+            };
+
+        auto const all = testable_amendments();
+
+        // Test VaultDelete with fixLendingProtocolV1_1 disabled
+        // Transaction fails if the data field is provided
+        test(
+            "fixLendingProtocolV1_1 disabled",
+            all - fixLendingProtocolV1_1,
+            std::string(maxDataPayloadLength, 'A'),
+            temDISABLED);
+
+        // Transaction fails if the data field is too large
+        test(
+            "fixLendingProtocolV1_1 enabled data too large",
+            all,
+            std::string(maxDataPayloadLength + 1, 'A'),
+            temMALFORMED);
+
+        // Transaction fails if the data field is set, but is empty
+        test("fixLendingProtocolV1_1 enabled data empty", all, std::string(0, 'A'), temMALFORMED);
+        test("fixLendingProtocolV1_1 enabled data valid", all, std::string(maxDataPayloadLength, 'A'), tesSUCCESS);
+    }
+
 public:
     void
     run() override
@@ -5013,6 +5061,7 @@ class Vault_test : public beast::unit_test::suite
         testVaultClawbackBurnShares();
         testVaultClawbackAssets();
         testAssetsMaximum();
+        testVaultDeleteData();
     }
 };
 

src/xrpld/app/tx/detail/VaultDelete.cpp

@@ -19,6 +19,13 @@ VaultDelete::preflight(PreflightContext const& ctx)
         return temMALFORMED;
     }
 
+    if (ctx.tx.isFieldPresent(sfData) && !ctx.rules.enabled(fixLendingProtocolV1_1))
+        return temDISABLED;
+
+    // The sfData field is an optional field used to record the deletion reason.
+    if (auto const data = ctx.tx[~sfData]; data && !validDataLength(data, maxDataPayloadLength))
+        return temMALFORMED;
+
     return tesSUCCESS;
 }