Work in customer support
Ask a customer what there customer number is
Go to the customer module
Find out that you can't search for customer number, even tho the customer can see the customer number on "My pages"
It is not possible to search on customer number in litium backoffice.
The customer number is the Id of the person in Litium (LSCxxxxxx).
The customer module should have a search similar to "Article Number" in the Pim.
Because the accelerator is using the customer number in many places. So the customer number is not exclusive to integrations.