Contract Multiplier vs RoundLot

1

Hi,
for a Futures Contract is the FIX convention to describe lot size as RoundLot(561) . Does the definition of this overlap with ContractMultiplier(231). Does Round Lot refer to the relationship of a contract to an underlying, or does RoundLot define the value of which Qty must be a multiple, or something else ?

I see that CME use ContractMultiplier in their ROE for futures and RoundLot does not seem to be present.
thanks

2

RoundLot more generic as equities there is the concept of round lot and odd lot, and what the round lot size is. Just looking at where this field is used it is mostly in the trading rules and market structure messages.

Whereas in futures and options it is typical to trade in number of contracts and each contract have different contract size.

Conceptually I would agree they do overlap.