Probleme with related entities inside FetchXml query

Hi Everybody,

I met a problem about the construction of a FetchXML query :

My need is to get the result of this SQL Query : 

SELECT DISTINCT Contact.ContactId
FROM Contact
LEFT OUTER JOIN grd_contact_ensemble
        INNER JOIN grd_ensemble
            ON grd_ensemble.grd_ensembleId = grd_contact_ensemble.grd_ensembleid   
    ON Contact.ContactId = grd_contact_ensemble.Contactid
LEFT OUTER JOIN grd_address
        INNER JOIN grd_communecp
            ON grd_communecp.grd_communecpId = grd_address.grd_PostalCodeId
    ON Contact.ContactId = grd_address.grd_ContactId
WHERE 
grd_ensemble.grd_code = 'A04024'
OR
grd_communecp.grd_cp LIKE '91220%'
OR 
grd_communecp.grd_cp LIKE '05%'

I tried to write somthing like this, but it seems that the usage of relation into fetch xml are limited:
In fact the clause WHERE OR between attributes of differents ralated entities seems to be impossible ?

<fetch version="1.0" output-format="xml-platform" mapping="logical" distinct="true" ><entity name="contact" ><attribute name="contactid" /><link-entity name="grd_address" from="grd_contactid" to="contactid" alias="ae" link-type="outer" ><link-entity name="grd_communecp" from="grd_communecpid" to="grd_postalcodeid" alias="af" ><filter type="and" ><filter type="or" ><condition attribute="grd_cp" operator="like" value="91220%" /><condition attribute="grd_cp" operator="like" value="05%" /></filter></filter></link-entity></link-entity><link-entity name="grd_contact_ensemble" from="contactid" to="contactid" visible="false" intersect="true" link-type="outer" ><link-entity name="grd_ensemble" from="grd_ensembleid" to="grd_ensembleid" alias="ag" ><filter type="and" ><condition attribute="grd_code" operator="eq" value="A04024" /></filter></link-entity></link-entity></entity></fetch>

Do you have any ideas about this issue ?

Thx in advance for your precious help :)

Kya