Cannot overwrite existing certificate/key using iControl certificate/key import_from_pem calls

I can't say what the problem is here, I have done the same using the python bigsuds module without a problem(and in that case, I use True as the parameter, which I don't believe has an equivalent in perl)

However, I want to make you aware that if you are trying to replace both the cert and the key, you are going to run into a problem where when you upload the cert, it errors out because it does not match the current key, and vice versa if you try the key first. This is really only useful if you have renewed a cert using the same private key. I'm not aware of a method for replacing both at the same time, I always end up creating a new one.