You changed your plan setup to the following, which is going to cause a mismatch error.
Plan 1 (non-exclusive)
- Plan 1a (exclusive)
- Plan 1b (exclusive)
This means if you select Plan 1 then you MUST select Plan 1a OR Plan 1b. Always keep in mind Exclusive = Mandatory within its parent.
If all 3 plans are meant to be independent of one another. Meaning they can only have 1 of the three at any given time then a simple configuration as follows is all you'd need.
Plan 1 (exclusive)
Plan 2 (exclusive)
Plan 3 (exclusive)
Otherwise you'd need to change your plans to the following if you don't want a child plan to be mandatory.
Plan 1 (non-exclusive)
- Plan 1a (non-exclusive)
- Plan 1b (non-exclusive)
Next if they should only have Plan 1a OR Plan 1b you need to configure conditions for that under the Workflows tab so they can't select 1b if 1a is selected for example.
In the below you describe your potential future structure.
www.joomlapolis.com/forum/277-cb-paid-subscriptions-support/242679-advice-making-changes-to-existing-plan-setup#319469
I would describe that in CBSubs as follows.
Member (exclusive)
Sponsor (exclusive)
- Gold Sponsor (non-exclusive)
Institution (exclusive)
- Gold Institution (non-exclusive)
Subscriber (exclusive)
- Gold Subscriber (non-exclusive)
There's no reason for those to all be tucked into "Member" as it complicates the setup too much. You'd just configure Sponsor, Institution, Subscriber to give the same access permissions as Member + extra. If you insist on having that setup one of the following.
Member (exclusive)
- Free (exclusive)
- Sponsor (exclusive)
- - Gold Sponsor (non-exclusive)
- Institution (exclusive)
- - Gold Institution (non-exclusive)
- Subscriber (exclusive)
- - Gold Subscriber (non-exclusive)
or
Member (exclusive)
- Sponsor (non-exclusive w/ conditions)
- - Gold Sponsor (non-exclusive)
- Institution (non-exclusive w/ conditions)
- - Gold Institution (non-exclusive)
- Subscriber (non-exclusive w/ conditions)
- - Gold Subscriber (non-exclusive)
Beats suggestion was accurate based off the information provided. You did not specifically state someone could be ONLY a Member, which seams to be where the confusion is coming from as you were clear you wanted permissions inheritance. The above should provide that, but you'll need to condition your plans since someone can't be Sponsor and Institution at the same time.