The letter does not itself determine immigration permission. Check entity coverage, duties, status and any required action before the employee starts the new work.
Resolve the relevant conditions before the business handover
Do not assume every reassignment needs the same filing or that none needs action. The actual approved arrangement and change must guide the timing.
Identify which duties remain delegated and what the applicant now performs. Moving within a corporate group is not the same as moving within a single approved arrangement, because any existing approval generally covers a specific entity or a defined set of related organizations, not every affiliate that happens to share common ownership. Confirm that the entity actually receiving the new assignment is one already covered by the existing filing, or that it independently has its own qualifying relationship with the organization the applicant currently works for, before assuming coverage carries over automatically. Group membership on an organizational chart is a useful starting point, but it is not itself proof that the specific receiving entity meets the ownership and control test the classification requires. Treat each new entity in the assignment chain as its own question, since an arrangement that works for one related organization does not necessarily extend to another simply because they appear under the same parent company, and confirm that assumption in writing rather than leaving it as an informal understanding.