Web services testing with CICS TS v2.3

[DS]

I have a client (SOAPUI cleint) sending web service request to a *CICS TS v2.3 program* for process, I am getting ASRA abend with
{code}
CICS Web Interface error
500 Internal Server Error
{code}

Sending XML request through SOAPUI client([www.soapui.org] not java cleint) to CICS TS v2.3

Code at Point of ABEND
{code}
*--------------------------------------------------
* CONVER ASCII TO EBCDIC FORMAT
*--------------------------------------------------
CONVERT-ASCII-TO-EBCDIC SECTION.
DISPLAY 'CONVERT-ASCII-TO-EBCDIC:'.
MOVE FUNCTION
DISPLAY-OF
( FUNCTION NATIONAL-OF
(LS-INBOUND-AREA ASCII-CCSID),
EBCDIC-CCSID
)
TO PASS-BODY.

CONVERT-ASCII-TO-EBCDIC-EXIT.
EXIT.
{code}
What are al available methods that we can test conversation between client & CICS mainframe regions?
Appreciate help for any docs/examples/URLs where I can get testing informationm.

Thanks & Regards,
DS.