The quote size offered by the liquidity provider is limited by the actual liquidity of the relevant hedging vehicle (e.g. the underlying asset or the listed or OTC options linked to the underlying asset). In this case, the liquidity provider may not be able to buy all 1,000 board lots of your bull CBBCs if the liquidity provider cannot unwind such hedging vehicle for all of the 1,000 board lots of your bull CBBCs (for example, because the relevant hedging vehicle is illiquid). The minimum quote size that a liquidity provider is committed to quote is 20 board lots.