a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS193 [Section] 5.1.12 [Statement text] 
While Consumer policy will govern when values from sources other than the Portlet update the publicValues, Consumers MUST apply Portlet supplied values (i.e. supplied on a portlet url parameter or on a response from performBlockingInteraction or handleEvents) to the publicValues and SHOULD supply the same value to Portlets which provide a navigationalParameterDescription referencing the same QName in the names array.
WSRP v2.0 Specification
Statement text