Yes, you are right, the name of the two countries are as follows:

SR. NAME OF THE STORE IN DATA NAME OF THE IMAGE
NO. COUNTRY FIELD IN FLAG FOLDER
==========================================================
1. SAUDI ARABIA S.ARABIA SAUDI
2. UNITED ARAB EMIRATES U.A.E. UAE

In expression builder I type code like:

mcountry=iif(supplier.country<>"S.ARABIA",supplier.country,"saudi")

But nothing happend, also no flag is showing against each country.

How can I handle this situation. Please suggest