clear(-1) and clear(1) always sets numeric to -2147483648 and 2147483647 respectively.
It does not take number encoding into account. i.e. when you clear a USHORT with -1 and 1 it should be 0 and 65535 respectively.
Clarion2Java models all numerics as 32bit signed integers. At key points it will enforce encoding (i.e. with OVER() attribute). But not all.
A number of areas system will yield different results. i.e. arithmetic that relies on binary overflow. Should not be a big deal because such logic does not belong in business software!
But clear is certainly a problem. if you clear a SHORT and that SHORT is a DB record column which is backed with a smallint SQL type, then it will not work.