Modified one rule in the modsecurity_http_policy.conf file located @ /etc/httpd/modsecurity.d/modsecurity_crs_30_http_policy.conf
FROM:
SecRule REQUEST_HEADERS:Content-Type "!(?:^(?:application/x-www-form-urlencoded$|multipart/form-data;)|text/xml)"
TO:
SecRule REQUEST_HEADERS:Content-Type "!(?:^(?:application/x-www-form-urlencoded$|application/x-www-form-urlencoded; charset=UTF-8$|multipart/form-data;)|text/xml)"
And it worked for me.