You have to send the funds to your CPK (as that is your external purse address), and that will let the (sendgscc) process succeed even if the wallet is locked. 
(exec rac pulls its values from the CPK balance btw).

We no longer source the sendgscc funds from the main wallet.

The stake is returned to your CPK as you spend it (it spends it back to itself) and breaks it into 10 pieces of change.