[Scip] Changing the bounds of a FIXED variable

[Vivek Periaraj]

Hello,

1) Is there a way to change the bounds of a fixed variable? I fix it using SCIPfixVar() but SCIPchgVarLb() and SCIPchgVarUb() does not allow me to change the bounds.
2) How to delete a variable from the problem object. If I do SCIPdelVar(), the variable is marked for deletion but it's not deleted from the problem object.

Regards, 
Vivek