if (residualAmount > 0) {
    underlyingToken.forceApprove(address(leverParams.vault), residualAmount);
    ICDPVault(leverParams.vault).modifyCollateralAndDebt(
        leverParams.position,
        address(this),
        address(this),
        0,
        -toInt256(residualAmount)
    );
}
function test_leverageDownWrongResidualHandling() public {
    uint256 depositAmount = 1_000 ether;
    uint256 borrowAmount = 200 ether;

    deal(address(token), user, depositAmount);

    address[] memory assets = new address[](2);
    assets[0] = address(token);
    assets[1] = address(underlyingToken);

    vm.startPrank(user);

    // User deposits 1k ETH collateral
    token.approve(address(vault), type(uint256).max);
    vault.deposit(address(userProxy), depositAmount);

    // User borrows 200 ETH
    userProxy.execute(
        address(positionAction),
        abi.encodeWithSelector(
            positionAction.borrow.selector,
            address(userProxy),
            address(vault),
            CreditParams({amount: borrowAmount, creditor: user, auxSwap: emptySwap})
        )
    );

    userProxy.execute(
        address(positionAction),
        abi.encodeWithSelector(
            positionAction.decreaseLever.selector,
            LeverParams({
                position: address(userProxy),
                vault: address(vault),
                collateralToken: address(token),
                primarySwap: SwapParams({
                    swapProtocol: SwapProtocol.BALANCER,
                    swapType: SwapType.EXACT_IN,
                    assetIn: address(token),
                    amount: vault.virtualDebt(address(userProxy)),
                    limit: 0,
                    recipient: address(positionAction),
                    residualRecipient: address(positionAction),
                    deadline: block.timestamp,
                    args: abi.encode(weightedPoolIdArray, assets)
                }),
                auxSwap: emptySwap,
                auxAction: emptyPoolActionParams
            }),
            201 ether,
            address(userProxy)
        )
    );

    vm.stopPrank();
}
Suite result: FAILED. 0 passed; 1 failed; 0 skipped; finished in 2.65s (4.18ms CPU time)

Ran 1 test suite in 2.66s (2.65s CPU time): 0 tests passed, 1 failed, 0 skipped (1 total tests)

Failing tests:
Encountered 1 failing test in src/test/integration/PositionAction20.lever.t.sol:PositionAction20_Lever_Test
[FAIL. Reason: CallerNotCreditManagerException()] test_leverageDownWrongResidualHandling() (gas: 1088990)
