Can Approved I-140/I-485 be Revoked?

myinfo2005

Registered Users (C)
Does anyone know that a Company can revoke Approved I-140 and(or) I-485s? Once the I-485 is approved, How long a person need to be with the same company? Is there any time limit? Or can he/she leave the Company whenever he/she wants, after his/her 485 approval?
 
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