I'll try to be as clear as possible.
I've got a page, displaying all the data from a table and an operation to insert a new record. The insertion form is represented in a popUp. There is a button whose action property calls a method in a managed bean.
Inside this method, in addition to the commit operation a execute another operation binding which is an ExecuteWithParameters binding, defined in a method call which comes right after the first page in the flow (i've used an unbounded task flow). Here i set a parameter, used as a bind variable in the query of the VO coming next.
After this, the method redirects to another page (return "secondPage.jsf" + "?faces-redirect=true";), which comes right after the method call in the task flow. This page displays the content of the record inserted. One of the fields, which is not fullfilled with data at first, is connected to an attribute with CLOB data type. I've used oracle.genericDomain as a converter (i've even tried to define my own converter but the result is the same).
The result is that buttons connected to operations like Commit/Rollback get activated, even without making any change at all, right in the moment the page loads. And if i omit the converter, this doesn't happen.