Hi,
You may use as many receivers with the same login-password as you can and in different countries
BUT
not at the same time. It means that your receiver in Germany is connected, and the other one in Spain is disconnected (unplugged), not in standby mode. Just unplug it completely from electric line. It must be without any connection to electricity, internet, etc.
Connection from different countries detected if your second receiver is in standby mode. Even if in standby, emulator goes on sending your login and password to the server. Server thinks that 2 receivers are sending your login-password at a time and warns you about rules violation.
When you leave from Germany, unplug receiver completely. When you arrive at Spain, plug your second receiver and use CS and vice versa.