Web Service XML Changes Return Table Field Names

I am writing a Web service to return a employee information from SAP using .Net Connector. My Webservice XML changes return table column names with few escape characters. Does anyone know why this happens? and How to prevent it?

Every column name is changed: e.g. PERS_NO to PERS_--5fNO

NCo -> 2.0

RFC- > Custom Function module

RFC Return Type -> ZFPSYNC

VS.Net -> VS Studio 2003, ( C# Web service)

Here is part of XML document:

<?xml version="1.0" encoding="utf-8" ?>

- http://www.w3.org/2001/XMLSchema" xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance" xmlns=" http://tempuri.org/">

- <ZFPSYNC>

<PERS_ 5fNO>00100001</PERS_ 5fNO>

<PDS_ 5fEMPID>00054740</PDS_ 5fEMPID>

<SSN>001380261</SSN>

<NAME_--5fPFX />

<FIRST_ 5fNAME>Tuesday</FIRST_ 5fNAME>

<LAST_ 5fNAME>October</LAST_ 5fNAME>

<NAME_--5fSFX />

<PRIOR_ 5fNAME>Tuesday October</PRIOR_ 5fNAME>

<NICKNAME />

<CO_ 5fCODE>TAX</CO_ 5fCODE>

<CO_ 5fCODE_ 5fT>Tax LLP</CO_ 5fCODE_ 5fT>

<CO_ 5fCTRY>US</CO_ 5fCTRY>

<ORG_ 5fUNIT>50191687</ORG_ 5fUNIT>

<ORG_ 5fUNIT_ 5fT>Northeast Region Lead Tax</ORG_ 5fUNIT_ 5fT>

<EE_ 5fLEVEL>C1</EE_ 5fLEVEL>

<EE_ 5fLEVEL_ 5fT>Firm Director</EE_ 5fLEVEL_ 5fT>

<SRV_ 5fAREA>TAX</SRV_ 5fAREA>

<SRV_ 5fAREA_ 5fT>Tax</SRV_ 5fAREA_ 5fT>

<JOB_ 5fFAM>CS-TAX</JOB_ 5fFAM>

<JOB_ 5fFAM_ 5fT>CS - Tax</JOB_ 5fFAM_ 5fT>

<PER_ 5fAREA>BOSX</PER_ 5fAREA>

<PER_ 5fAREA_ 5fT>Boston-Berkeley St-TAX</PER_ 5fAREA_ 5fT>

<PER_ 5fADDR>200 Berkeley Street</PER_ 5fADDR>