Hi Dhruv,
I just checked. The BUPA search really won't work in AXT.
Please have a look at the following document: http://help.sap.com/saphelp_crm700_ehp01/helpdata/en/e3/687051b1594db7978cdd4f2d3f440b/content.htm?frameset=/en/e3/68705…
I guess setting the correct field type (i.e. Application Reference of type Account) should solve your problem.
However, I haven't tried this myself so far.
Best,
Christian