The position of a post-function in the list of post-functions for a transition is an important factor for its proper execution. When adding a new post-function to a transition, you must move it to the appropriate position, which depends on the type of transition ( Create or regular) and the type of post-function you configure.
On the Create transition
All the JMWE post-functions should always be placed after the Creates the issue originally built-in post-function, although some might work even when placed before it.
Post-functions that set or access fields from linked issues should always be placed after the Creates the issue originally post-function so that the link is established when the post-function is triggered.
Starting with JMWE for Jira Server version 5.0.0, post-functions that set system fields can now be placed after the Creates the issue originally post-function
On any regular transition
Most post-functions should be placed anywhere in the list before the Update change history for an issue and store the issue in the database post-function, except for the post-functions that transition issues (see below).
Transition [XXX] issue(s) post-functions
Post-functions that automatically transition issues should always be placed at the end of the list of post-functions. This applies to the following post-functions: