As shown in the picture:
This part in this assemble is movable.
However, after I insert it into another assemble and mate the moving part with the fixed board:
I can't move it any more.
Can any 1 tell me how can i fix it?
Thanks for everyone help:D
RMB on the subassembly and open its properties. Near the lower right corner, you'll find a checkbox labelled "solve as flexible".