Description

Adding the 'Value Field' condition check to a workflow transition means that a user cannot see that transition unless a certain field is set to a specified value. The validation for the condition is able to compare strings, numbers or option id's. For select fields, you may compare either by string or option id, the latter may be better, as the label of an option may change over time, the id however does not.
If a field can have several values (like components), it is enough, if one of the values matches the conditionit.

Since version 1.4.10, date and date-time fields are also supported.

...

You must specify the field and value that will be the prerequisite for the conditioncheck. For example:

If you choose the comparison type String, only '=' and '!=' are valid options. 
You may leave value empty and choose comparison type '!=', to tell that a given field is required for the condition. 
For date fields without time, use the format 'yyyy-MM-dd' for values, and for those with time 'yyyy-MM-dd HH:mm'. 
Example February 12th 2014: 2014-02-12, at 8:05 AM: 2014-02-12 08:05, at 4 PM: 2014-02-12 16:00.

For information on how to configure a condition check for a workflow transition in JIRA, see the JIRA documentation.

...

A workflow is configured so that the 'Start Progress' transition has the 'Value Field' condition check set to 'MultiSelect' = '10021' (option id). A user viewing an issue in that workflow will not see the 'Start Progress' transition unless 'MultiSelect' has at least the option with id '10021' choosenchosen.

Supported Field Types