Error Importing GSD file using Simatic Net

Hi

We are trying to create a Profibus-DP network using a computer, a CP-5613 and some devices. The first phase of the project is done and it's working. There are some ET-200 and some Simeas P connected to the network.
Now, for the second phase, we have to insert some Siprotec Devices on the network. We have the latest GSD files, but when we try to import the files, we receive an error message as you can see on the attached file. It's just possible to import the GSD files after delete all the equipments, the DP network, compile the Simatic Net and the Net Pro, close the Simatic Net and open it again. The problem is that I'm can't delete all the equipments because this is a running and tested project, so delete and create everything again would be a disaster.

Does someone know something about it?

Regards,

Zerbati