Bulk Edit in MS CRM 4.0

Hi Guys,

I'm facing one serious issue while performing Bulk edit in MS CRM 4.0

For Example: I have Entity A, in that there is one option set with three values (Achieved, Claim, Claimable). Whenever i changed the value from "Claim" to "Claimable" in bulk edit, after finishing when i looked the record , the value is revert back to "Claim".

There is update plugin also for the Entity A. What the reason behind this? Can anyone please help me to resolve this issue