Documentation for JIRA 4.3. Documentation for other versions of JIRA is available too.

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If you do not like how the Number custom field is displaying in Jira (for example, if you do not want it to display the commas), you can modify a velocity file to configure this. In particular, look at the file WEB-INF/classes/templates/plugins/fields/view/view-number.vm. As mentioned here:

At the moment to change the way the numbers are printed the easiest thing to do is to edit:
under the JIRA web application and replace:

and restart.

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