diff --git a/internal/batch/batch_processor.go b/internal/batch/batch_processor.go
index 2887b8745..7d396b1ce 100644
--- a/internal/batch/batch_processor.go
+++ b/internal/batch/batch_processor.go
@@ -600,7 +600,15 @@ func (bp *batchProcessor) dispatchBatch(state *DispatchState) error {
 	// Call the dispatcher to do the heavy lifting - will only exit if we're closed
 	return operations.RunWithOperationContext(bp.ctx, func(ctx context.Context) error {
 		return bp.retry.Do(ctx, "batch dispatch", func(attempt int) (retry bool, err error) {
-			return true, bp.conf.dispatch(ctx, state)
+			err = bp.conf.dispatch(ctx, state)
+			if err != nil {
+				conflictErr, conflictTestOk := err.(operations.ConflictError)
+				if conflictTestOk && conflictErr.IsConflictError() {
+					// We know that the connector has received our batch, so we shouldn't need to retry
+					return true, nil
+				}
+			}
+			return true, err
 		})
 	})
 }
diff --git a/internal/blockchain/common/common.go b/internal/blockchain/common/common.go
index 0da135b7d..f5181681d 100644
--- a/internal/blockchain/common/common.go
+++ b/internal/blockchain/common/common.go
@@ -21,8 +21,11 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"net/http"
 	"strings"
 
+	"github.com/go-resty/resty/v2"
+	"github.com/hyperledger/firefly-common/pkg/ffresty"
 	"github.com/hyperledger/firefly-common/pkg/fftypes"
 	"github.com/hyperledger/firefly-common/pkg/i18n"
 	"github.com/hyperledger/firefly-common/pkg/log"
@@ -84,6 +87,24 @@ type BlockchainReceiptNotification struct {
 	ProtocolID string `json:"protocolId,omitempty"`
 }
 
+type BlockchainRESTError struct {
+	Error string `json:"error,omitempty"`
+	// See https://github.com/hyperledger/firefly-transaction-manager/blob/main/pkg/ffcapi/submission_error.go
+	SubmissionRejected bool `json:"submissionRejected,omitempty"`
+}
+
+type conflictError struct {
+	err error
+}
+
+func (ce *conflictError) Error() string {
+	return ce.err.Error()
+}
+
+func (ce *conflictError) IsConflictError() bool {
+	return true
+}
+
 func NewBlockchainCallbacks() BlockchainCallbacks {
 	return &callbacks{
 		handlers:   make(map[string]blockchain.Callbacks),
@@ -320,3 +341,16 @@ func HandleReceipt(ctx context.Context, plugin core.Named, reply *BlockchainRece
 
 	return nil
 }
+
+func WrapRestError(ctx context.Context, errRes *BlockchainRESTError, res *resty.Response, err error, defMsgKey i18n.ErrorMessageKey) error {
+	if errRes != nil && errRes.Error != "" {
+		if res != nil && res.StatusCode() == http.StatusConflict {
+			return &conflictError{err: i18n.WrapError(ctx, err, coremsgs.MsgBlockchainConnectorRESTErrConflict, errRes.Error)}
+		}
+		return i18n.WrapError(ctx, err, defMsgKey, errRes.Error)
+	}
+	if res != nil && res.StatusCode() == http.StatusConflict {
+		return &conflictError{err: ffresty.WrapRestErr(ctx, res, err, coremsgs.MsgBlockchainConnectorRESTErrConflict)}
+	}
+	return ffresty.WrapRestErr(ctx, res, err, defMsgKey)
+}
diff --git a/internal/blockchain/ethereum/ethereum.go b/internal/blockchain/ethereum/ethereum.go
index e0fcde5d8..b23d27fdd 100644
--- a/internal/blockchain/ethereum/ethereum.go
+++ b/internal/blockchain/ethereum/ethereum.go
@@ -566,14 +566,14 @@ func (e *Ethereum) invokeContractMethod(ctx context.Context, address, signingKey
 	if err != nil {
 		return err
 	}
-	var resErr ethError
+	var resErr common.BlockchainRESTError
 	res, err := e.client.R().
 		SetContext(ctx).
 		SetBody(body).
 		SetError(&resErr).
 		Post("/")
 	if err != nil || !res.IsSuccess() {
-		return wrapError(ctx, &resErr, res, err)
+		return common.WrapRestError(ctx, &resErr, res, err, coremsgs.MsgEthConnectorRESTErr)
 	}
 	return nil
 }
diff --git a/internal/coremsgs/en_error_messages.go b/internal/coremsgs/en_error_messages.go
index a704e98cb..fd85fa67c 100644
--- a/internal/coremsgs/en_error_messages.go
+++ b/internal/coremsgs/en_error_messages.go
@@ -278,4 +278,12 @@ var (
 	MsgMissingNamespace                   = ffe("FF10437", "Missing namespace in request", 400)
 	MsgDeprecatedResetWithAutoReload      = ffe("FF10438", "The deprecated reset API cannot be used when dynamic config reload is enabled", 409)
 	MsgConfigArrayVsRawConfigMismatch     = ffe("FF10439", "Error processing configuration - mismatch between raw and processed array lengths")
+	MsgDefaultChannelNotConfigured        = ffe("FF10440", "No default channel configured for this namespace", 400)
+	MsgNamespaceInitializing              = ffe("FF10441", "Namespace '%s' is initializing", 412)
+	MsgPinsNotAssigned                    = ffe("FF10442", "Message cannot be sent because pins have not been assigned")
+	MsgMethodDoesNotSupportPinning        = ffe("FF10443", "This method does not support passing a payload for pinning")
+	MsgOperationNotFoundInTransaction     = ffe("FF10444", "No operation of type %s was found in transaction '%s'")
+	MsgCannotSetParameterWithMessage      = ffe("FF10445", "Cannot provide a value for '%s' when pinning a message", 400)
+	MsgNamespaceNotStarted                = ffe("FF10446", "Namespace '%s' is not started", 412)
+	MsgBlockchainConnectorRESTErrConflict = ffe("FF10447", "Conflict from blockchain connector: %s", 409)
 )
diff --git a/internal/operations/manager.go b/internal/operations/manager.go
index 700f204c2..ac260d4e7 100644
--- a/internal/operations/manager.go
+++ b/internal/operations/manager.go
@@ -58,6 +58,11 @@ const (
 	RemainPendingOnFailure RunOperationOption = iota
 )
 
+// ConflictError can be implemented by connectors to prevent an operation being overridden to failed
+type ConflictError interface {
+	IsConflictError() bool
+}
+
 type operationsManager struct {
 	ctx       context.Context
 	namespace string
@@ -127,14 +132,26 @@ func (om *operationsManager) RunOperation(ctx context.Context, op *core.Prepared
 	log.L(ctx).Tracef("Operation detail: %+v", op)
 	outputs, complete, err := handler.RunOperation(ctx, op)
 	if err != nil {
-		om.SubmitOperationUpdate(&core.OperationUpdate{
-			NamespacedOpID: op.NamespacedIDString(),
-			Plugin:         op.Plugin,
-			Status:         failState,
-			ErrorMessage:   err.Error(),
-			Output:         outputs,
-		})
+		conflictErr, ok := err.(ConflictError)
+		if ok && conflictErr.IsConflictError() {
+			// We are now pending - we know the connector has the action we're attempting to submit
+			//
+			// The async processing in SubmitOperationUpdate does not allow us to go back to pending, if
+			// we have progressed to failed through an async event that gets ordered before this update.
+			// So this is safe
+			failState = core.OpStatusPending
+			log.L(ctx).Infof("Setting operation %s operation %s status to %s after conflict", op.Type, op.ID, failState)
+		} else {
+			om.SubmitOperationUpdate(&core.OperationUpdate{
+				NamespacedOpID: op.NamespacedIDString(),
+				Plugin:         op.Plugin,
+				Status:         failState,
+				ErrorMessage:   err.Error(),
+				Output:         outputs,
+			})
+		}
 	} else if complete {
+
 		om.SubmitOperationUpdate(&core.OperationUpdate{
 			NamespacedOpID: op.NamespacedIDString(),
 			Plugin:         op.Plugin,
diff --git a/internal/operations/operation_updater.go b/internal/operations/operation_updater.go
index 5928eeec2..82677e94d 100644
--- a/internal/operations/operation_updater.go
+++ b/internal/operations/operation_updater.go
@@ -104,6 +104,12 @@ func (ou *operationUpdater) SubmitOperationUpdate(ctx context.Context, update *c
 	}
 
 	if ou.conf.workerCount > 0 {
+		if update.Status == core.OpStatusFailed {
+			// We do a cache update pre-emptively, as for idempotency checking on an error status we want to
+			// see the update immediately - even though it's being asynchronously flushed to the storage
+			ou.manager.updateCachedOperation(id, update.Status, &update.ErrorMessage, update.Output, nil)
+		}
+
 		select {
 		case ou.pickWorker(ctx, id, update) <- update:
 		case <-ou.ctx.Done():