It is not possible to change the Department in the Resource workspace unless the two Departments have a Location in common.
Steps to Reproduce:
Expected Results: You can change Department and Location to Development/Tokyo.
Actual Results:
Clarity 16.4.2
DE210014
This issue is under review.
Workaround: Use Classic to update Department, which will blank Location that need to be set to the right Location before saving (both Department and Location changes will be saved at the same time).