diff --git a/batch_attr.go b/batch_attr.go
index 9e3b127c..16ebd5f6 100644
--- a/batch_attr.go
+++ b/batch_attr.go
@@ -115,6 +115,7 @@ func (ba *batchAttr) setRead(rp *BatchPolicy) {
 	case ReadModeSCAllowUnavailable:
 		ba.infoAttr = _INFO3_SC_READ_TYPE | _INFO3_SC_READ_RELAX
 	}
+	ba.txnAttr = 0
 	ba.expiration = uint32(rp.ReadTouchTTLPercent)
 	ba.generation = 0
 	ba.hasWrite = false
@@ -142,6 +143,7 @@ func (ba *batchAttr) setBatchRead(rp *BatchReadPolicy) {
 	case ReadModeSCAllowUnavailable:
 		ba.infoAttr = _INFO3_SC_READ_TYPE | _INFO3_SC_READ_RELAX
 	}
+	ba.txnAttr = 0
 	ba.expiration = uint32(rp.ReadTouchTTLPercent)
 	ba.generation = 0
 	ba.hasWrite = false
@@ -174,6 +176,7 @@ func (ba *batchAttr) setBatchWrite(wp *BatchWritePolicy) {
 	ba.readAttr = 0
 	ba.writeAttr = _INFO2_WRITE | _INFO2_RESPOND_ALL_OPS
 	ba.infoAttr = 0
+	ba.txnAttr = 0
 	ba.expiration = wp.Expiration
 	ba.hasWrite = true
 	ba.sendKey = wp.SendKey
@@ -209,6 +212,10 @@ func (ba *batchAttr) setBatchWrite(wp *BatchWritePolicy) {
 		ba.writeAttr |= _INFO2_DURABLE_DELETE
 	}
 
+	if wp.OnLockingOnly {
+		ba.txnAttr |= _INFO4_MRT_ON_LOCKING_ONLY
+	}
+
 	if wp.CommitLevel == COMMIT_MASTER {
 		ba.infoAttr |= _INFO3_COMMIT_MASTER
 	}
@@ -251,6 +258,7 @@ func (ba *batchAttr) setBatchUDF(up *BatchUDFPolicy) {
 	ba.readAttr = 0
 	ba.writeAttr = _INFO2_WRITE
 	ba.infoAttr = 0
+	ba.txnAttr = 0
 	ba.expiration = up.Expiration
 	ba.generation = 0
 	ba.hasWrite = true
@@ -260,6 +268,10 @@ func (ba *batchAttr) setBatchUDF(up *BatchUDFPolicy) {
 		ba.writeAttr |= _INFO2_DURABLE_DELETE
 	}
 
+	if up.OnLockingOnly {
+		ba.txnAttr |= _INFO4_MRT_ON_LOCKING_ONLY
+	}
+
 	if up.CommitLevel == COMMIT_MASTER {
 		ba.infoAttr |= _INFO3_COMMIT_MASTER
 	}
@@ -270,6 +282,7 @@ func (ba *batchAttr) setBatchDelete(dp *BatchDeletePolicy) {
 	ba.readAttr = 0
 	ba.writeAttr = _INFO2_WRITE | _INFO2_RESPOND_ALL_OPS | _INFO2_DELETE
 	ba.infoAttr = 0
+	ba.txnAttr = 0
 	ba.expiration = 0
 	ba.hasWrite = true
 	ba.sendKey = dp.SendKey
diff --git a/batch_udf_policy.go b/batch_udf_policy.go
index e43ba9a3..59b38026 100644
--- a/batch_udf_policy.go
+++ b/batch_udf_policy.go
@@ -43,6 +43,16 @@ type BatchUDFPolicy struct {
 	// Valid for Aerospike Server Enterprise Edition 3.10+ only.
 	DurableDelete bool
 
+	// Execute the write command only if the record is not already locked by this transaction.
+	// If this field is true and the record is already locked by this transaction, the command
+	// will return an error with the [types.MRT_ALREADY_LOCKED] error code.
+	//
+	// This field is useful for safely retrying non-idempotent writes as an alternative to simply
+	// aborting the transaction.
+	//
+	// Default: false
+	OnLockingOnly bool
+
 	// SendKey determines to whether send user defined key in addition to hash digest on both reads and writes.
 	// If true and the UDF writes a record, the key will be stored with the record on the server.
 	// The default is to not send the user defined key.
diff --git a/batch_write_policy.go b/batch_write_policy.go
index 5574ad0a..83ea260b 100644
--- a/batch_write_policy.go
+++ b/batch_write_policy.go
@@ -67,6 +67,16 @@ type BatchWritePolicy struct {
 	// Valid for Aerospike Server Enterprise Edition 3.10+ only.
 	DurableDelete bool
 
+	// Execute the write command only if the record is not already locked by this transaction.
+	// If this field is true and the record is already locked by this transaction, the command
+	// will return an error with the [types.MRT_ALREADY_LOCKED] error code.
+	//
+	// This field is useful for safely retrying non-idempotent writes as an alternative to simply
+	// aborting the transaction.
+	//
+	// Default: false
+	OnLockingOnly bool
+
 	// SendKey determines to whether send user defined key in addition to hash digest on both reads and writes.
 	// If the key is sent on a write, the key will be stored with the record on
 	// the server.
diff --git a/command.go b/command.go
index 57aec92f..3ff8de89 100644
--- a/command.go
+++ b/command.go
@@ -92,6 +92,8 @@ const (
 	_INFO4_MRT_ROLL_FORWARD = (1 << 1)
 	// Roll back MRT.
 	_INFO4_MRT_ROLL_BACK = (1 << 2)
+	// Must be able to lock record in transaction.
+	_INFO4_MRT_ON_LOCKING_ONLY = (1 << 4)
 
 	// Interpret SC_READ bits in info3.
 	//
@@ -2892,6 +2894,7 @@ func (cmd *baseCommand) writeHeaderWrite(policy *WritePolicy, writeAttr, fieldCo
 	generation := uint32(0)
 	readAttr := 0
 	infoAttr := 0
+	txnAttr := 0
 
 	switch policy.RecordExistsAction {
 	case UPDATE:
@@ -2923,6 +2926,10 @@ func (cmd *baseCommand) writeHeaderWrite(policy *WritePolicy, writeAttr, fieldCo
 		writeAttr |= _INFO2_DURABLE_DELETE
 	}
 
+	if policy.OnLockingOnly {
+		txnAttr |= _INFO4_MRT_ON_LOCKING_ONLY
+	}
+
 	// if (policy.Xdr) {
 	// 	readAttr |= _INFO1_XDR;
 	// }
@@ -2932,7 +2939,7 @@ func (cmd *baseCommand) writeHeaderWrite(policy *WritePolicy, writeAttr, fieldCo
 	cmd.dataBuffer[9] = byte(readAttr)
 	cmd.dataBuffer[10] = byte(writeAttr)
 	cmd.dataBuffer[11] = byte(infoAttr)
-	cmd.dataBuffer[12] = 0 // unused
+	cmd.dataBuffer[12] = byte(txnAttr)
 	cmd.dataBuffer[13] = 0 // clear the result code
 	cmd.dataOffset = 14
 	cmd.WriteUint32(generation)
@@ -2954,6 +2961,7 @@ func (cmd *baseCommand) writeHeaderReadWrite(policy *WritePolicy, args *operateA
 	readAttr := args.readAttr
 	writeAttr := args.writeAttr
 	infoAttr := 0
+	txnAttr := 0
 	operationCount := len(args.operations)
 
 	switch policy.RecordExistsAction {
@@ -2986,6 +2994,10 @@ func (cmd *baseCommand) writeHeaderReadWrite(policy *WritePolicy, args *operateA
 		writeAttr |= _INFO2_DURABLE_DELETE
 	}
 
+	if policy.OnLockingOnly {
+		txnAttr |= _INFO4_MRT_ON_LOCKING_ONLY
+	}
+
 	// if (policy.xdr) {
 	// 	readAttr |= _INFO1_XDR;
 	// }
@@ -3013,7 +3025,7 @@ func (cmd *baseCommand) writeHeaderReadWrite(policy *WritePolicy, args *operateA
 	cmd.dataBuffer[9] = byte(readAttr)
 	cmd.dataBuffer[10] = byte(writeAttr)
 	cmd.dataBuffer[11] = byte(infoAttr)
-	cmd.dataBuffer[12] = 0 // unused
+	cmd.dataBuffer[12] = byte(txnAttr)
 	cmd.dataBuffer[13] = 0 // clear the result code
 	cmd.dataOffset = 14
 	cmd.WriteUint32(generation)
@@ -3113,7 +3125,7 @@ func (cmd *baseCommand) writeKeyAttr(
 	cmd.WriteByte(byte(attr.readAttr))
 	cmd.WriteByte(byte(attr.writeAttr))
 	cmd.WriteByte(byte(attr.infoAttr))
-	cmd.WriteByte(0) // unused
+	cmd.WriteByte(byte(attr.txnAttr))
 	cmd.WriteByte(0) // clear the result code
 	cmd.WriteUint32(attr.generation)
 	cmd.WriteUint32(attr.expiration)
diff --git a/write_policy.go b/write_policy.go
index 32a96cf5..7eea7481 100644
--- a/write_policy.go
+++ b/write_policy.go
@@ -74,6 +74,16 @@ type WritePolicy struct {
 	// This prevents deleted records from reappearing after node failures.
 	// Valid for Aerospike Server Enterprise Edition 3.10+ only.
 	DurableDelete bool
+
+	// Execute the write command only if the record is not already locked by this transaction.
+	// If this field is true and the record is already locked by this transaction, the command
+	// will return an error with the [types.MRT_ALREADY_LOCKED] error code.
+	//
+	// This field is useful for safely retrying non-idempotent writes as an alternative to simply
+	// aborting the transaction.
+	//
+	// Default: false
+	OnLockingOnly bool
 }
 
 // NewWritePolicy initializes a new WritePolicy instance with default parameters.