This is a follow up to [Referendum 46](https://polkadot.polkassembly.io/referendum/46), which failed because Polkadot did not have a default XCM version set. This protection, that the Relay Chain will not dispatch messages without a minimum safe version, was put in place after a previous vulnerability. Since this is the first cross-chain interaction that Polkadot has had, the version was not initialized.

The batch of calls contains the same two calls as Referendum 46, with an additional call to set the default XCM version of Polkadot to 2.

![](https://i.imgur.com/DLFYewu.png)
![](https://i.imgur.com/wJzxnkv.png)

maybeXcmVersion

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- There was a problem with a previous referendum that failed because Polkadot didn't have a default XCM version set.
- The Relay Chain now has a protection in place to not send messages without a safe version.
- This is the first time Polkadot is interacting with other chains, so the version wasn't set.
- A new referendum is being proposed to set the default XCM version of Polkadot to 2.
- There are some pictures showing the details of the referendum.

#47 Upgrade Shell to Statemint (with XCM Fix)