This is for customizing issue IDs, not Project Keys.
Is there any workaround that allows issue ID is generated in following form?
A-Z A-Z A-Z YYMMDD-(serial number of the day)
No, its not possible, they are numeric.
If you want some kind of magic ID that the issue key does not provide, eg to indicate relative age (oh, maybe be like JIRA bug reports :) ) then you would be better off and safer, to implement a custom field _however_, it would only be useful to use for locating, rather than be used in a ranged query, and if that were your intention, then the existing 'created' value and issue key could be used without any customization whatsoever.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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