WSO2 REST API: как вернуть более одной строки в запросе GET

Не могли бы вы посоветовать, как получить более одной строки? Мой источник API:

<inSequence xmlns = "http://ws.apache.org/ns/synapse">
<property expression = "json-eval($.vendorId)" name = "vendorId" scope = "default" type = "STRING"/>
  <dblookup>
        <connection>
            <pool>
                <dsName>MyDS</dsName>
            </pool>
        </connection>
        <statement>
            <sql><![CDATA[select * from db_view v where v.vendorId = nvl(?, v.vendorId)]]></sql>
            <parameter expression = "$ctx:vendorId" type = "VARCHAR"/>
            <result column = "vendorId" name = "vendorId"/>
            <result column = "vendorName" name = "vendorName"/>
        </statement>
    </dblookup>
    <filter xpath = "boolean($ctx:vendorId)">
        <then>
            <payloadFactory media-type = "json">
                <format>{"result":     { "vendorId" : "$1","vendorName" : "$2"}}</format>
                <args>
                    <arg evaluator = "xml" expression = "$ctx:vendorId" literal = "false"/>
                    <arg evaluator = "xml" expression = "$ctx:vendorName" literal = "false"/>
                </args>
            </payloadFactory>
        </then>
        <else>
            <payloadFactory media-type = "json">
                <format>{"response" : { "code" : "01","message" : "fail"}}</format>
            </payloadFactory>
        </else>
    </filter>
</inSequence>

Мое представление базы данных возвращает 5 строк, но я получаю только первую строку из запроса GET:

{"result": { "vendorId" : "123",        "vendorName" : "My Vendor N1"    }}

Также, если я передам параметр vendorId = 321, API должно вернуть 0 строк. В текущий момент ВСЕГДА возвращает первую строку из представления. Почему и как заставить это работать? заранее спасибо

ВЫЗЫВАТЬ Медиатор:

<resource methods = "GET" uri-template = "/get/supplier/{filterQuery}">
      <inSequence>
         <property name = "operation" value = "view" scope = "default" type = "STRING"/>
         <log level = "full" separator = "|">
            <property name = "operation" expression = "get-property('operation')"/>
            <property name = "step" value = "request"/>
         </log>
         <property name = "filterQuery" expression = "get-property('uri.var.filterQuery')" scope = "default" type = "STRING"/>
         <log level = "full" separator = "|">
            <property name = "filterQuery" expression = "$ctx:filterQuery"/>
         </log>
         <callout serviceURL = "http://...:8280/services/serviceName" action = "/vendors/$ctx:filterQuery">
            <source type = "envelope"/>
            <target key = "response"/>
         </callout>
         <log level = "custom" separator = "|">
            <property name = "MESSAGE" expression = "$ctx:response"/>
         </log>
         <property name = "res" expression = "$ctx:response" scope = "default" type = "OM"/>
         <property name = "NO_ENTITY_BODY" scope = "axis2" action = "remove"/>
         <property name = "RESPONSE" value = "true" scope = "default" type = "STRING"/>
         <property name = "messageType" value = "application/json" scope = "axis2" type = "STRING"/>
         <property name = "contentType" value = "application/json" scope = "transport" type = "STRING"/>
         <payloadFactory media-type = "json">
            <format>{"vendorId": "$1","vendorName": "$2"}</format>
            <args/>
         </payloadFactory>
         <log level = "full" separator = "|">
            <property name = "operation" expression = "$ctx:operation"/>
            <property name = "step" value = "response"/>
         </log>
         <respond/>
      </inSequence>
      <faultSequence>
         <payloadFactory media-type = "json">
            <format>{"response" : {"code" : "01", "message" : "fail"}}</format>
            <args/>
         </payloadFactory>
      </faultSequence>
   </resource>