Is it possible to disable completed versions in BitBucket?

Question

Bitbucket

Hello.
I use BitBucket to set tasks when developing a site.
I ran into a problem: after the completion of the next iteration, it would be nice to remove the version of this iteration from the drop-down field when creating a task (screenshot: goo.gl/7x7mrf ).
Yes, but if you delete this version in the project settings, then all tasks lose their binding to this version (screenshot: savepic.ru/11077455.png )
Can you tell me if there is any way out?