Difference between using Transfer and local Transfer

Summary:

Hello Everyone,

I have a question i would be grateful if someone could help me find the answer to this.

Currently there are 2 screen named transfer:

1. Local and Global Transfer
2. Transfer

I am aware that when using the Transfer screen, the current assignment is updated and the current work relationship and other assignment remains unchanged.

When using Local and Global Transfer screen,

if the legal employer is changed this basically creates a new work relationship for the employee and end his current one but

if the legal employer is not changed the current assignment is updated and the current work relationship and other assignment remains unchanged.