I'm not a dba so I'm not that familiar with the correct terms for some of the following. Sorry about that!
Can you have shcema synonm triggers on tables with long data types?
i.e. say you have a table schemax.table and the first column is numeric and another column in the table is a long datatype. A trigger is set up so that you can do a select/insert/whatever on the table using schema1.table and it would only effect rows with 1 in that first column, but you wouldn't have to specify that column in the where clause.
They're trying something similar to this at work and its screwing everything else because they can't get it to work on tables with the long or clob datatype.