Setting Session Variable (setPropertyValue) error in MII 14

Hi,

In an application in SAP MII 14 SP04, I'm setting session variable through setPropertyValue method -

"document.<appletObj>.setPropertyValue(<propertyName>, "%")".

Here, I specifically want to set property value as "%".

The same code worked on xMII 11.5 but its giving following error in MII 14 -

Applet 442 LiveConnect Worker Thread [ERROR] - Error Setting Property <propertyName> to % com.sap.xmii.protocol.ProtocolReaderException: Error reading Header.

Initially I thought it of JRE version issue, but its replicating on various versions of JRE (1.6.0 updates 17,20,22,27,31 and 1.7.0 update 55).

Is there any other way to set session variable ?

Appreciate your help.

Thanks,

Sumit