Did you accidentally choose the wrong issue type scheme in JIRA and then find you can't update the Fix Version field? Here's a guide for restoring the default settings.
If you need any further help with this or with anything related to Zoho CRM, give me a shout at [email protected] or call me on 0414 885 787
I run a Zoho CRM consultancy (www.nuanced.it) with offices in Sydney and Melbourne.