Contract extension versus Contract change, and end date

Summary

Contract extension versus Contract change, and end date

Content

Hi All.

We would like to chenge the contract type in the same assignment. Is it possible?

As we see, there is no contract change action.

There is only Contract Extension action. Is this action Contract Extension used to create  new contract type information? In that case, why we must update the end date?

Thans in adavance.

Leonor