diff --git a/x/crosschain/keeper/msg_server_vote_inbound_tx.go b/x/crosschain/keeper/msg_server_vote_inbound_tx.go
index 366636fab5..34e71be9b0 100644
--- a/x/crosschain/keeper/msg_server_vote_inbound_tx.go
+++ b/x/crosschain/keeper/msg_server_vote_inbound_tx.go
@@ -2,6 +2,8 @@ package keeper
 
 import (
 	"context"
+	errorsmod "cosmossdk.io/errors"
+	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/zeta-chain/zetacore/common"
@@ -55,6 +57,11 @@ func (k msgServer) VoteOnObservedInboundTx(goCtx context.Context, msg *types.Msg
 	ctx := sdk.UnwrapSDKContext(goCtx)
 	index := msg.Digest()
 
+	// Check if the inbound has already been processed.
+	if k.IsFinalizedInbound(ctx, msg.InTxHash, msg.SenderChainId, msg.EventIndex) {
+		return nil, errorsmod.Wrap(types.ErrObservedTxAlreadyFinalized, fmt.Sprintf("InTxHash:%s, SenderChainID:%d, EventIndex:%d", msg.InTxHash, msg.SenderChainId, msg.EventIndex))
+	}
+
 	// vote on inbound ballot
 	finalized, err := k.zetaObserverKeeper.VoteOnInboundBallot(
 		ctx,
diff --git a/x/observer/keeper/vote_inbound.go b/x/observer/keeper/vote_inbound.go
index da5744b5cd..f663a9b768 100644
--- a/x/observer/keeper/vote_inbound.go
+++ b/x/observer/keeper/vote_inbound.go
@@ -70,10 +70,6 @@ func (k Keeper) VoteOnInboundBallot(
 		return false, err
 	}
 	if isNew {
-		// Check if the inbound has already been processed.
-		//if k.IsFinalizedInbound(ctx, msg.InTxHash, msg.SenderChainId, msg.EventIndex) {
-		//	return false, errorsmod.Wrap(types.ErrObservedTxAlreadyFinalized, fmt.Sprintf("InTxHash:%s, SenderChainID:%d, EventIndex:%d", msg.InTxHash, msg.SenderChainId, msg.EventIndex))
-		//}
 		EmitEventBallotCreated(ctx, ballot, inTxHash, senderChain.String())
 	}