RTL or HVAR support replication even if the primary and replicate database schema or column datatypes differ.
If you define a default value for a replicate Adaptive Server column, you need not set the NULL-able attribute for the column since the replicate Adaptive Server automatically fills the column with the default value.
If you define a default value for a replicate Sybase IQ column, you need not set the NULL-able attribute for the column since the replicate Sybase IQ automatically fills the column with the default value.