Hi Adarsha,
ME always accepts references only.you can do this in two ways,
1. Form a string with respective business object + site + object and pass.(ex: SFCBO:<SITE>,<SFC>) and then pass as reference.
2. through SOAP UI request XML. ex:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:me="http://sap.com/xi/ME" xmlns:gdt="http://sap.com/xi/SAPGlobal/GDT">
<soapenv:Header/>
<soapenv:Body>
<ParametricRequest_sync xmlns="http://sap.com/xi/ME">
<ParametricRequest>
<SiteRef>
<Site>SITE1</Site>
</SiteRef>
<me:SfcRef>
<me:Sfc>SFC1</me:Sfc>
</me:SfcRef>
<DcGroupRef>
<DcGroup>ABC</DcGroup>
<Revision>A</Revision>
</DcGroupRef>
<ParametricMeasure>
<MeasureGroup>ABC</MeasureGroup>
<MeasureName>PARAM1</MeasureName>
<Actual>1</Actual>
</ParametricMeasure>
<ResourceRef>
<Resource>RESOURCE1</Resource>
</ResourceRef>
<me:OperationRef>
<me:Operation>OPERATION1</me:Operation>
<me:Revision>A</me:Revision>
</me:OperationRef>
</ParametricRequest>
</ParametricRequest_sync>
</soapenv:Body>
</soapenv:Envelope>
hope this helps.