AS400 data truncation via JDBC adapter

I want to allow the data to be truncated when inserting into as400 tables. The JDBC driver class for the as400 allows a property setting of data truncation=false, but it doesn’t seem to make a difference.

DataSource Class = com.ibm.as400.access.AS400JDBCDataSource
other Properties = data truncation=false;

Am I misunderstanding the use of that property?