SFTP command with src-address parameter

Hi, I’m trying to upload some files to a SFTP server from my routers. The command I’m using is the following one:

/tool fetch upload=yes url="sftp://serverIP/path/file" user=myUser password=myPassword src-path=file src-address=myIP
failure: only http[s]/sftp supports src-address

I don’t understand why I’m getting this error since I’m using sftp… (without the src-address parameter the error disappears, but i need to have this parameter in order to work for every router I have)

Is this a bug or I’m using the command wrong?