Use:

This postfunction allows to set assignee from some project role. It may be:

• role member with minimum amount of issues in current project;
• role member with minimum remaining estimates in current project;
• role member who was the last assignee of this issue;
• default role member. Set user property to the user, who should be the default role member.
   The name of the property is a role name. The value of the property is a code of the project, where the user should be a default role member. For example: Property name = Developer and Property value = Dev

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