Having read some posts online, once a data type for a custom field has been added, it's pretty much set in stone. The easiest option appears to be create a new custom field and migrate the ticket information across. But what is the best way of going about this?
It was my mistake to begin with. An internal reference (which is just six numbers) I created as a text field. Now, with nearly some 500 tasks generated later, I'm wondering if I can create a new numeric reference field and migrate the tickets to use this field instead?
Is this possible?
After you create the new field you could export all your data, then bulk import the data back into Jira with value going to the new field. Then you would remove the old text field from the screen.
Or you could use an automation rule to loop through all your issues and copy from one field to the other.
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