BO4 - error during decoding in aps log

Hi,

User got 30270 error processing dp commands

and had a look in log a

WebIntelligenceProcessingServer1.processDPCommandsEx|localhost:|.doIt|biprod02:5628:114424.458161:1|

ClTUri7gFktaoZfW0T1EX102e4aa|||||||||com.businessobjects.mds.services.parser.decoder.DataFoundationSQLDecoder||

DataFoundationSQLDecoder.decodeExpression: Error during decoding!‑

Any thoughts - was thinking  invalid definition of object but would have thought they woudl get oracle error message with this - have seen oracle error messages when been a problem with definition of object in business layer.

Thanks