Complex Query using SOAP ContractServiceV2

Hi,

I hope you can help me, I'm trying to get all active contracts filtering for a especific DFF value at line level.

Something like this:

Select *

from contract_table ct,

        contract_lines ctl

where 1 = 1

and ct.contract_number = 4003

and ct.status = 'ACTIVE'

and ct.contract_id = ctl.contract_line

and ctl.attribute8 in (value1, value2) --tvsaPoid

But Using the SOAP ContractServiceV2 -> findContract operation:

I built the next payload (unfortunly it's not working):

<ns2:filter>

               <ns2:group>

                  <ns2:conjunction>And</ns2:conjunction>

                  <ns2:upperCaseCompare/>

                  <ns2:item>

                     <ns2:conjunction>And</ns2:conjunction>

                     <ns2:upperCaseCompare/>

                     <ns2:attribute>ContractNumber</ns2:attribute>

                     <ns2:operator>=</ns2:operator>