Problem With Platform.alterTables(Database, boolean, boolean, boolean)

[Big Jim]

I am using dbutils to update a MSSQL database.  My code contains the 
following statement:  platform.alterTables(database, false, true, 
false); which according to the API doc should tell dbuitls to NOT 
attempt to drop columns in the existing database.table that are not in 
the xml schema.  Despite setting the dodrop flag to false dbutils is 
attempting to drop the colomn.  This would not be a problem except that 
the column has a default constraint which is not being dropped first 
which causes an SQL exception can't drop column because it depends on 
constraint.  Is there a way around this other then to put the column in 
question back into the schema so dbutils does not try to drop it?

Thanks,
Jim