Hi Chetan,
If you are trying on iOS yes, the UIAConfiguration file format is different in 3.2 and is not compatible with the 3.0 version. A possible solution is that in the Mime repository upload the configuration file as UIAConfiguration_iOS_32.xml and in the BAdI (/mac/rs_badi_def_clnt_xml) that retrieves the XML, based on the Users sales Org send this new file but at runtime change the name to UIAConfiguration_iOS.xml
Regards,
Harsha