yes, First to know if is this, check the language connection of your friend. If your friend has connected in othe language, we found the problem. Other way to find check if this is the problem is following this steps:
F1 on the field "Reporting Period"
Look for Data Element and double click on it
Now you are in SE11, double click on Domain
Go to Value Range and you if there are values, on top on SAP GUI click on GoTo->Translations
If there arent values may be the domain has a value table (on the bot of the SAP GUI in Value Range you can find the table, double click on it and may be this isnt a text table, you can go to the text table clicking GoTo->Text Table)
I hope it will be useful.
Regards,
Alberto