The renew command only applies to domain names. It has no meaning for other object types.
Renew commands will only be processed if the expiry date of the domain name is within 6 months.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:ietf:params:xml:ns:epp-1.0
epp-1.0.xsd">
<command>
<renew>
<domain:renew
xmlns:domain="urn:ietf:params:xml:ns:domain-1.0"
xsi:schemaLocation="urn:ietf:params:xml:ns:domain-1.0
domain-1.0.xsd">
<domain:name>example.co.uk</domain:name>
<domain:curExpDate>2009-04-07</domain:curExpDate>
<domain:period unit="y">2</domain:period>
</domain:renew>
</renew>
<clTRID>ABC-12345</clTRID>
</command>
</epp>
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.nominet.org.uk/epp/xml/epp-1.0
epp-1.0.xsd">
<response>
<result code="1000">
<msg>Command completed successfully</msg>
</result>
<resData>
<domain:renData
xmlns:domain="urn:ietf:params:xml:ns:domain-1.0"
xsi:schemaLocation="urn:ietf:params:xml:ns:domain-1.0
domain-1.0.xsd">
<domain:name>example.co.uk</domain:name>
<domain:exDate>2010-12-12T13:04:46</domain:exDate>
</domain:renData>
</resData>
<trID>
<clTRID>EPP-ABC-12345</clTRID>
<svTRID>112642</svTRID>
</trID>
</response>
</epp>