Forwarding Table mapping in matlab 2010a

We have Matlab 2010a library(Library_2010). I am using one block from this library in my model. And I have mapped forwarding table in such a way that this block will link to the block in another library (Library_2010_updated). However it is not linking to another lib than original I am writing script in PostLoadFcn of original 2010a lib, set_param('Library_2010/Subsystem_A', 'ForwardingTable', {{'Library_2010/Subsystem_A', 'Library_2010_updated/Subsystem_A_up'}}); Am I missing something? Please help!