Question: Remember tables and forget command

Dear friends, please I would like to ask for your help with the following problem: 

I have a remember table generated by a recursive procedure

x:= proc(n)
option remember; 
end proc:

It helps compute x(1), x(2), x(3), x(4). 

After several additional steps I have a new x(2), say 

x(2):= 3; 

With this new x(2) I need to recompute x(3), x(4). I've tried 

forget( x, [ x(3), x(4) ], subfunctions = false ); 



However, I do not get the new values of x(3) and x(4) but the old ones. What could it be wrong? 

Many thanks for your help.  

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