a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS118 [Section] 7.3 [Statement text] 
If a Producer chooses to return the enduring state of its Portlets to the Consumer, it is RECOMMENDED that the portletHandle encode the supplied registrationHandle. In this case, it is also RECOMMENDED that the portletState encode the portletHandle so that the Producer can do reasonable cross checks that it is receiving a consistent set of handles and state.
WSRP v2.0 Specification
Statement text