I agree with P’ Surachai comment.
In my opinion, this is not changing of policy and procedure. It is delegation of approval authorities and format of approval. Currently cashiers are reported to finance, so all H3 (petty cash reimbursement) should be approved by finance function instead of warehouse. This prolicy is still in place. It is only changing of function to approve.
How finance function will delegate approval authority within their own function and way to approve is their own business judgment and responsibility.