MS SQL and searchable=true

[Andrea Fae']

Using search standard widget with MS SQL server and trying to search only typing a string causes this error

for example when I search simply "202h719" it appears this

Query Not Supported: ('42000', u'[42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Argument data type text is invalid for argument 1 of lower function. (8116) (SQLExecDirectW)')

if I search typing asset.nome = "202H719" it works.