Odbc Driver for linux - bindparam problem

Hi,

We have 2 servers, one with sql server 2008 r2 and the other with rhel 6.4

ODBC Driver 11 for SQL Server has been installed on lnux server, Unixodbc 2.3.0 also
We are using PDO for access data objets

There is following error in odbc.log when there is a bindparam to initialise a parameter in a stored procedure :
  DIAG [22001] [Microsoft][ODBC Driver 11 for SQL Server]String data, right truncation

Do you have an idea ?

Thanks a lot