Through JIRA configuration, you may create a post function on the Create transition of a given Issue Type that sets the Fix Version field, but you must specify a set value and it will apply everywhere for that Issue Type or at least Projects configured to utilize that issue type scheme.
If you do not wish to use the Fix Version field for whatever reason, you can remove the field from your configuration and screens. To be honest, I thought JIRA Core excluded this field by default...
My response is probably coming late but I would like to share my workaround.
I simply created a custom field which is based on values provided in Version (Project Settings), I created a context for this field related to the project and there I was able to define a default value for this custom field. A the end I just copy value from this field to fixVersion field during issue creation transition. I used a plug-in workflow post function but it is may available in native Jira post-functions.
No code required and works fine!!
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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