I'm using the Group module. I created a group(Job Post) with linked content types (Job details).
Scenario: As a user, I created several jobs.
I want to be able to invite/message another group (Business) for them to be aware of my posting without joining this group.
Also, because I have more than one active jobs, I want to select a job to send the invite about.
Lastly, if I have already did an invitation to that group, I can no longer send twice.
Question: How can I achieve these three items above?
Note: a User is someone who creates or posts a job (example: electric power shortage). Businesses are created groups, like electricians. The user should invite this business to get notified about his job.