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Try setting the ChangeEventPolicy="ppr" to "none" and test again.
i tried already, as it described in Andrejus Baranovskis's Blog
if i set ppr=none, then the whole master-details stops working right away...
Have you setup a ppr trigger in the detail which points to the master? If you set the changeEventPolicy to none you have to ppr the component yourself.
when you say ppr component, could you provide an example, a piece of code?
what i proved as a working cure is execute query on master...
as i found out further, the problem is somehow related to region.
after export to excel button is pressed, i try to refresh current page fragment by navigating to another fragment and back.
then i receive an error: component region1:1:t1 is not registred for active data...server exception during PPR, #1
(region1 is my region, t1 is defined in page fragment)