These are some questions we will hear if you will have an interview for an IS-U position:
Tell me about master data in IS-U.
When you advice the customer to use the regional structure and when you can live without using it?
What about billing master data, what can you tell me.
How can we install a device only for billing?
Describe the FI-CA - Billing integration for account determination.
Describe the concept of RTP Billing.
If anyone has any other questions please post it in the comments and I will add them here.