Hi @Laif, thank you for your patience in this matter. I finally managed to st up Jira data centre v7 on my end and tested your workflow, but I didn’t run into the problem you have described.
Once I updated the custom field ID from your Function node to a valid ID on my end, the ticket got created as expected. So I’ll go ahead and mark this as resolved on my end as well, seeing this this is working for you on newer Jira versions (and seeing Jira 7 has reached its end of life in 2020).
I’ll take a look at your other Jira issue Jira Connector: Kaskading Fields - Questions - n8n next and will report back as soon as I can.