If you are using the the 3.6.x version that your expressions section is out of date (the format you were using is for older version):
<!--Contract-->
<layer>
<token/>
<definitionexpression/>
<enableprintgrid>true</enableprintgrid>
<enableexport>true</enableexport>
<name>Contracts</name>
<url>http://bvlwbip74.conoco.net/ArcGIS/rest/services/RPA_Maps/RPA_Land/MapServer/0</url>
<expressions>
<expression alias="Number" textsearchlabel="Search Number" isvaluerequired="true">
<values>
<value prompt="Example: 255088" isvaluerequired="true">upper(CONTRACT) LIKE upper('%[value]%')</value>
</values>
</expression>
<expression alias="Agency Number" textsearchlabel="Search Agency Number" isvaluerequired="true">
<values>
<value prompt="Example: 411753" isvaluerequired="true">upper(AGENCY_NO) LIKE upper('%[value]%')</value>
</values>
</expression>
<expression alias="Prospect" textsearchlabel="Search Prospect" isvaluerequired="true">
<values>
<value prompt="Example: Little River" isvaluerequired="true">upper(PROSPECT) LIKE upper('%[value]%')</value>
</values>
</expression>
<expression alias="Type" textsearchlabel="Search Type" isvaluerequired="true">
<values>
<value prompt="Example: Forced Pooling Order" isvaluerequired="true">upper(TYPE) LIKE upper('%[value]%')</value>
</values>
</expression>
</expressions>
<graphicalsearchlabel>Use one of the graphical search tools to select</graphicalsearchlabel>
<spatialsearchlayer>true</spatialsearchlayer>
<titlefield>CONTRACT</titlefield>
<fields all="false">
<field name="CONTRACT" alias="Contract Number"/>
<field name="STATE" alias="State" gridfield="true"/>
<field name="COUNTY" alias="County" gridfield="true"/>
<field name="PROSPECT" alias="Prospect"/>
<field name="TYPE" alias="Type"/>
<field name="AGENCY_NO" alias="Agency Number"/>
<field name="EFF_DTE" alias="Effective Date" dateformat="MM/DD/YYYY" gridfield="true"/>
<field name="EXP_DTE" alias="Expiration Date" dateformat="MM/DD/YYYY" gridfield="true"/>
<field name="LINK" alias="LiveLink" hyperlinkgridfield="true"/>
<field name="LEGACY_NO" gridfield="true" gridfieldonly="true"/>
<field name="DESCRIPTION" gridfield="true" gridfieldonly="true"/>
<field name="GROSS_ACRES" gridfield="true" gridfieldonly="true"/>
<field name="NET_ACRES" gridfield="true" gridfieldonly="true"/>
<field name="PROSP_NO" gridfield="true" gridfieldonly="true"/>
<field name="ASSET_AREA" gridfield="true" gridfieldonly="true"/>
<field name="BU" gridfield="true" gridfieldonly="true"/>
<field name="HERITAGE_CO" gridfield="true" gridfieldonly="true"/>
<field name="EXP_DATE" gridfield="true" gridfieldonly="true"/>
<field name="EFF_DATE" gridfield="true" gridfieldonly="true"/>
<field name="GRP_CODE" gridfield="true" gridfieldonly="true"/>
<field name="STAGE" gridfield="true" gridfieldonly="true"/>
<field name="CNTY_CODE" gridfield="true" gridfieldonly="true"/>
<field name="FILE_NUM" gridfield="true" gridfieldonly="true"/>
<field name="SDE_UPDATE" gridfield="true" dateformat="MM/DD/YYYY" gridfieldonly="true"/>
<field name="FILE_KEY" gridfield="true" gridfieldonly="true"/>
</fields>
<icon isfield="false">assets/images/Livelink.gif</icon>
<linkfield>LINK</linkfield>
<zoomscale>50000</zoomscale>
</layer>