Can user have permission to resolve the tickets but no permission to update FixVersion.

[Veeravenkata Sampathkumar Garapati]

I need to give edit permission to 'Fix version' only few users. But now whoever can resolve an issue can also edit fix version. I don't want all the users who can resolve an issue to edit fix version.

[Ignacio Pulgar]

Yes, as stated in the software permissions overview:

Backlog — Versions
Create version	Project Admin permission, or JIRA Admin permission
Edit version	Project Admin permission, or JIRA Admin permission
Add issue to version	Edit Issues permission
Remove issue from version	Edit Issues permission

And on core permissions overview:

Resolve issues	Permission to resolve and reopen issues. This also includes the ability to set the 'Fix For version' field for issues. Requires the Transition issues permission. Also see the Close Issues permission.
Close issues	Permission to close issues based on the workflow conditions. (This permission is useful where, for example, developers resolve issues and testers close them). Requires the Transition issue and Resolve issue transitions. Also see the Resolve Issues permission.

So, you just need to check the permission scheme set on your project and ensure users are set under the correct project roles, modifying the scheme if needed.