Object Webservice : Invalid XML

Hi guys, 

I have an object webservice from invoices, and when I do a request to read one invoice the answer is: "Invalid XML: double quote missing at line 1 near <?xml version="1.0" encoding="utf-8" ?". But in the body of request doesn't exist none type of xml.

I leave the order code below:

<soapenv:Envelope xmlns:xsi="">www.w3.org/.../XMLSchema-instance" xmlns:xsd="">www.w3.org/.../XMLSchema" xmlns:soapenv="">schemas.xmlsoap.org/.../" xmlns:wss="">http://www.adonix.com/WSS" xmlns:soapenc="">schemas.xmlsoap.org/.../">
<soapenv:Header/>
<soapenv:Body>
<wss:read soapenv:encodingStyle="">schemas.xmlsoap.org/.../">
<callContext xsi:type="wss:CAdxCallContext">
<codeLang xsi:type="xsd:string">POR</codeLang>
<poolAlias xsi:type="xsd:string">TBQ</poolAlias>
<poolId xsi:type="xsd:string">TBQ</poolId>
<requestConfig xsi:type="xsd:string">adxwss.beautify=true</requestConfig>
</callContext>
<publicName xsi:type="xsd:string">WSSIH</publicName>
<objectKeys soapenc:arrayType="wss:CAdxParamKeyValue[]" xsi:type="wss:ArrayOfCAdxParamKeyValue">
<CAdxParamKeyValue>
<key>NUM</key>
<value>F9689-2019/00183</value>
</CAdxParamKeyValue>
</objectKeys>
</wss:read>
</soapenv:Body>
</soapenv:Envelope>

Can anyone help me please?

Thank you so much