webservice错误

我客户端调用webservice时
方法只需要一个参数，
我发送空字符串或者该xml一部分
<ESPT>
    <MAIN>
      <AGREEMENT>
        <LOANS>
          <LOANBANK> </LOANBANK>
          <LOAN_LIST/>
        </LOANS>
        <PRODUCTS>
          <AMONTTOTAL> </AMONTTOTAL>
          <PRDCOUNT>1</PRDCOUNT>
          <PREMTOTAL>10.00</PREMTOTAL>
          <PRODUCT_LIST>
 不会报错
如果全部发送
<ESPT>
    <MAIN>
      <AGREEMENT>
        <LOANS>
          <LOANBANK> </LOANBANK>
          <LOAN_LIST/>
        </LOANS>
        <PRODUCTS>
          <AMONTTOTAL> </AMONTTOTAL>
          <PRDCOUNT>1</PRDCOUNT>
          <PREMTOTAL>10.00</PREMTOTAL>
          <PRODUCT_LIST>
            <PRODUCT>
              <AMOUNT> </AMOUNT>
              <CURRENCY>CNY</CURRENCY>
              <EVENTNO> </EVENTNO>
              <EVENTTIME>2011-12-20 10:01:01</EVENTTIME>
              <ISDID>1</ISDID>
              <ISRPERIOD> </ISRPERIOD>
              <ISRUNIT>D</ISRUNIT>
              <MRTYPE>1</MRTYPE>
              <PAYPERIOD> </PAYPERIOD>
              <PAYTYPE>2011-12-20 10:01:01</PAYTYPE>
              <PRDCODE>1118939800000001</PRDCODE>
              <PREMIUM>10</PREMIUM>
              <VALIDDATE>2011-12-20</VALIDDATE>
              <VALIDTIME>10:01:0</VALIDTIME>
            </PRODUCT>
          </PRODUCT_LIST>
        </PRODUCTS>
      </AGREEMENT>
      <APPLICANT>
        <APPADDR> </APPADDR>
        <APPBIRTH> </APPBIRTH>
        <APPEMAIL> </APPEMAIL>
        <APPGENDER> </APPGENDER>
        <APPIDNO> </APPIDNO>
        <APPIDTYPE> </APPIDTYPE>
        <APPMOBILE> </APPMOBILE>
        <APPNAME>周权</APPNAME>
        <APPPOST> </APPPOST>
        <APPPROFCODE> </APPPROFCODE>
        <APPPROFTYPE> </APPPROFTYPE>
        <APPTEL>10000000</APPTEL>
      </APPLICANT>
      <BENEFICIARYS>
        <BENEFICIARY_LIST>
          <BENEFICIARY>
            <BNFADDR> </BNFADDR>
            <BNFBIRTH> </BNFBIRTH>
            <BNFEMAIL> </BNFEMAIL>
            <BNFGENDER>M</BNFGENDER>
            <BNFID>1</BNFID>
            <BNFIDNO>44444444444444</BNFIDNO>
            <BNFIDTYPE> </BNFIDTYPE>
            <BNFISDRLT>M</BNFISDRLT>
            <BNFMOBILE> </BNFMOBILE>
            <BNFNAME>宁波分公司</BNFNAME>
            <BNFORDER> </BNFORDER>
            <BNFPOST> </BNFPOST>
            <BNFSHARE>100</BNFSHARE>
            <BNFTEL>8888888</BNFTEL>
            <ISDID> </ISDID>
            <PRDCODE> </PRDCODE>
          </BENEFICIARY>
        </BENEFICIARY_LIST>
        <BNFCOUNT>1</BNFCOUNT>
      </BENEFICIARYS>
      <INSUREDS>
        <INSURED_LIST>
          <INSURED>
            <APPRLT>M</APPRLT>
            <ISDADDR> </ISDADDR>
            <ISDBIRTH> </ISDBIRTH>
            <ISDEMAIL> </ISDEMAIL>
            <ISDGENDER>M</ISDGENDER>
            <ISDHEALTHNOTICE> </ISDHEALTHNOTICE>
            <ISDID>1</ISDID>
            <ISDIDNO>44444444444444</ISDIDNO>
            <ISDIDTYPE> </ISDIDTYPE>
            <ISDMID> </ISDMID>
            <ISDMOBILE> </ISDMOBILE>
            <ISDNAME>宁波分公司</ISDNAME>
            <ISDPOST> </ISDPOST>
            <ISDPROFCODE> </ISDPROFCODE>
            <ISDPROFTYPE> </ISDPROFTYPE>
            <ISDTEL>8888888</ISDTEL>
            <ISDTYPE> </ISDTYPE>
          </INSURED>
        </INSURED_LIST>
        <ISDCOUNT>1</ISDCOUNT>
      </INSUREDS>
      <MANAGE>
        <AGENTNO>21033302610001</AGENTNO>
        <APPDATE>2011-12-20 10:01:02</APPDATE>
        <APPNO>1</APPNO>
        <APPTYPE>1</APPTYPE>
      </MANAGE>
    </MAIN>
    <SYSTEM>
      <ROUTE>
        <PROVNO>330000</PROVNO>
      </ROUTE>
      <SECURITY>
        <DIGISIGN> </DIGISIGN>
      </SECURITY>
      <TRANCHANNEL>21033302610001</TRANCHANNEL>
      <TRANCODE>2001</TRANCODE>
      <TRANNO>1324612390428</TRANNO>
      <TRANTIME>2011-12-23 11:53:10</TRANTIME>
    </SYSTEM>
  </ESPT>
就会报错，意思就是，参数太长就会报错，这个问题怎么解决