add callback

modules/apps/transfer/keeper/callbacks.go

@@ -0,0 +1,19 @@
+package keeper
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	capabilitytypes "github.com/cosmos/cosmos-sdk/x/capability/types"
+	"github.com/cosmos/ibc-go/modules/core/exported"
+)
+
+// SendPacket is called by a module in order to send an IBC packet on a channel
+// end owned by the calling module to the corresponding module on the counterparty
+// chain.
+func (k Keeper) SendPacket(
+	ctx sdk.Context,
+	channelCap *capabilitytypes.Capability,
+	packet exported.PacketI,
+) error {
+	//todo
+	return k.channelKeeper.SendPacket(ctx, channelCap, packet)
+}

modules/apps/transfer/module.go

@@ -246,7 +246,7 @@ func (am AppModule) OnChanOpenInit(
 		transferVersion = appVersion
 	}
 
-	if err := ValidateTransferChannelParams(ctx, am.keeper, order, portID, channelID, appVersion); err != nil {
+	if err := ValidateTransferChannelParams(ctx, am.keeper, order, portID, channelID, transferVersion); err != nil {
 		return err
 	}