> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-docs-add-b20-spec.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# IPolicyRegistry.updateComposite

> Generated B20 reference for updateComposite(uint64,uint64[]).

[Related concept](/base-chain/specs/upgrades/beryl/b20/specification/concepts/policies-and-scopes)

## Signature

```solidity theme={null}
function updateComposite(uint64 policyId, uint64[] calldata childPolicyIds) external;
```

| Field               | Value                              |
| ------------------- | ---------------------------------- |
| Selector            | `0xbfe142c0`                       |
| Canonical signature | `updateComposite(uint64,uint64[])` |

## Description

Replaces a composite policy's child-policy set in full with `childPolicyIds`.
Dev: Reverts with `PolicyNotFound` when `policyId` does not exist.
Dev: Reverts with `IncompatiblePolicyType` when `policyId` is not a composite (UNION or INTERSECT).
Dev: Reverts with `Unauthorized` when the caller is not the current admin. A renounced composite
(admin `address(0)`) can never be updated.
Dev: Reverts with `ChildPoliciesOutsideOfRange(2, 4)` when `childPolicyIds.length` is not in `[2, 4]`;
there is no clear-the-list path (the composite child-policy range, not the 64-account batch limit).
Dev: Reverts with `PolicyNotFound` when any child policy does not exist.
Dev: Reverts with `InvalidChildPolicy` when any child policy is itself a composite
(not a simple policy).
Param: policyId       Composite policy to update.
Param: childPolicyIds Complete new set of existing simple policy IDs.

## Access control

Callable by the policy admin for the target policy.

## Policy interaction

This is part of the singleton PolicyRegistry surface used by B20 policy scopes.

## Example

```solidity theme={null}
IPolicyRegistry(target).updateComposite(arg0, arg1);
```

## Related

* [IPolicyRegistry reference](/base-chain/specs/upgrades/beryl/b20/specification/reference/interfaces/IPolicyRegistry)
* [Constants & addresses](/base-chain/specs/upgrades/beryl/b20/specification/reference/constants-and-addresses)