Business Objects - Oracle binary double data type

Hello,

I would like use Business Objects (XI 3.1 SP2) with scientist data and an Oracle 11G database. For a better accuracy on floating data, I use Oracle binary double datatype, but this datatype is not supported by Business Objects. WebI and Designer throw an exception (Exception : CS, Non supported datatype).

Does anyone has encountered this kind of problem, and if so found a solution?

Best regards.