Billing group and cost center mapping validation and automatic update for a user

Background

At the moment, cost centers may have no linked billing group.

• When importing users with cost centers from CSV files, we can only manually check which users don't have a billing group.
• When linking cost center with billing group, billing group will not automatically update for the user with the center and should be set manually.

Approach

Validation

Implement Check billing links control to allow admin to:

• check that all users have a corresponding cost center and billing group
  • The corresponding message should be shown to the admin: All users have a corresponding cost center and billing group
• view missing group/center links
  • the list of users with missing billing groups should be shown

Automatic update

• Implement automatic update of user's attributes if the user-linked group/center is changed.

The issue names no files, tests, or entry points, so first trace the admin controls and user, cost-center, and billing-group update flows. Done means the validation reports complete or missing links, lists users with missing billing groups, and linked group or center changes update the user's attributes automatically.