correction

[diplomacy]

I am working in a company and going to distribute the following announcement but not sure if completely right>

so, please correct it

any change in the duty's shift is unconsidered unless chairman approves it provided that the official form shall be submitted.

[Raymott]

I am working in a company and going to distribute the following announcement but not sure if completely right>

so, please correct it

any change in the duty's shift is unconsidered unless chairman approves it provided that the official form shall be submitted.

What is a "duty's shift"? I'm not sure if you are referring to a change in shift (the times worked) or a change in duty (the work done).
However:
A change in shift only comes into effect once the official form is submitted and approved by the chairman.