Add Departments details to Asset Assignment

Hi,

In Oracle Applications 11i, the Assets Assignment form (FAXASSET) has details like:
-employee name
-Expense account and
-Location Key flexfield which consists of 4 segments: City, Building, Floor and Room

The user sometimes needs to assign the asset to a department and not to a particular employee.
On the test instance, I have tried to add a fifth segment to the Location KFF.
Now, after I reassign the asset to the new location I have the following error:

Please enter a value for the parameter or segment Department.

I think it has to do with never using the fifth segment before.