a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS076 [Section] 5.4.3 [Statement text] 
If the Consumer has set the portletState field to "cloneBeforeWrite", persistent state changes are allowed only if the Producer first clones the Portlet. If the Producer does not clone the Portlet, processing attempts to modify persistent state MUST proceed as if the Consumer had specified "readOnly" for portletState.
WSRP v2.0 Specification
Statement text