Decimal conversion issue on solana side.

[dmsoltech]

Hello, layerzero team. I have been working on OFT implementation between EVM and Solana side.
I am sure EVM OFT should be fine, but I am wondering if there may be some issues regarding decimal conversion calculation on the Solana side.

impl OftConfig {
    // todo: optimize
    pub fn init(
        &mut self,
        endpoint_program: Option<Pubkey>,
        admin: Pubkey,
        shared_decimals: u8,
        decimals: u8,
        accounts: &[AccountInfo],
        oapp_signer: Pubkey,
    ) -> Result<()> {
        self.admin = admin;
        self.endpoint_program = if let Some(endpoint_program) = endpoint_program {
            endpoint_program
        } else {
            ENDPOINT_ID
        };

        require!(decimals >= shared_decimals, OftError::InvalidDecimals);
        self.ld2sd_rate = 10u64.pow((decimals - shared_decimals) as u32);

        // register oapp
        oapp::endpoint_cpi::register_oapp(
            self.endpoint_program,
            oapp_signer,
            accounts,
            &[OFT_SEED, &get_oft_config_seed(self).to_bytes(), &[self.bump]],
            RegisterOAppParams { delegate: self.admin },
        )
    }

    pub fn ld2sd(&self, amount_ld: u64) -> u64 {
        amount_ld / self.ld2sd_rate
    }

    pub fn sd2ld(&self, amount_sd: u64) -> u64 {
        amount_sd * self.ld2sd_rate
    }

    pub fn remove_dust(&self, amount_ld: u64) -> u64 {
        amount_ld - amount_ld % self.ld2sd_rate
    }
}

I guess, shared_decimals should be 18, and decimals should be 6.
That's because SPL tokens almost have 6 as its decimals, while EVM tokens almost have 18.
But according to the present implementation, it always return error because of below contraint.
require!(decimals >= shared_decimals, OftError::InvalidDecimals);

And I was not sure about amountLD and amoundSD calculation inside lz_receive and send instruction.
Hope you let me know, what I had implemented incorrectly.