RoundingModulus <469> field – FIX 4.3 – FIX Dictionary
For CIV - a float value indicating the value to which rounding is required.
i.e. 10 means round to a multiple of 10 units/shares; 0.5 means round to a multiple of 0.5 units/shares.
The default, if RoundingDirection <468> is specified without RoundingModulus <469>, is to round to a whole unit/share.