Add the following schema definition into the sforce_partner.xsd file in Designer:
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<complexType name="RelationshipReferenceTo">
<sequence>
<element name="referenceTo" type="xsd:string" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
</complexType>
<complexType name="RecordTypesSupported">
<sequence>
<element name="recordTypeInfos" type="tns:RecordTypeInfo" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
</complexType>
<complexType name="SearchLayoutButtonsDisplayed">
<sequence>
<element name="applicable" type="xsd:boolean"/>
<element name="buttons" type="tns:SearchLayoutButton" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
</complexType>
<complexType name="SearchLayoutButton">
<sequence>
<element name="apiName" type="xsd:string"/>
<element name="label" type="xsd:string"/>
</sequence>
</complexType>
<complexType name="SearchLayoutFieldsDisplayed">
<sequence>
<element name="applicable" type="xsd:boolean"/>
<element name="fields" type="tns:SearchLayoutField" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
</complexType>
<complexType name="SearchLayoutField">
<sequence>
<element name="apiName" type="xsd:string"/>
<element name="label" type="xsd:string"/>
<element name="sortable" type="xsd:boolean"/>
</sequence>
</complexType>
<complexType name="RecordTypeInfo">
<sequence>
<element name="available" type="xsd:boolean"/>
<element name="defaultRecordTypeMapping" type="xsd:boolean"/>
<element name="master" type="xsd:boolean"/>
<element name="name" type="xsd:string"/>
<element name="recordTypeId" type="tns:ID" nillable="true"/>
</sequence>
</complexType>
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