Enter IMEI number. If the number is maintained:
There are two methods to add the contract:
1. Search the article via Master data -> Articles -> Search. Click on edit. Look for the Point "IMEI" on the bottom right side of the article data. When adding the contract you can receive an internal error. But this error can be ignored.
2. You add another article "OPTIONEN". You need to enter any serial number (maybe telephone number). Afterwards you add the contract to this article. Important is to maintain the price of the original article.