Entity managment through UI problem

Hi
We have problem with many-to-many custom entities. When we try to add custom field to Opportunity through UI, we can’t add any more fields and we get error: “A model for “Oro\Bundle\UserBundle\Entity\User::opportunity_users_involved”
We have always tried to clear cache, force schema update, refresh configurations of Entity Extend module – it does not help.

Also have problem with field labels, when change the field label through UI, changes are not saved. We have get no errors, just nothing happens.

Last: problem with calendar, when we open full view of calendar we get JS error: “cannot call method getboundingclientrect of undefined” and the calendar view does not open.

Topic

[jankanParticipant]

Update:
What we want to do, is to establish many-to-many relationship (“users_involved”) between Opportunities and Users. When we add such a field do Opportunities it looks like it does not create required field on Users side (we get error: “A model for “OroCRM\Bundle\SalesBundle\Entity\Opportunity::user_users_involved” was not found”).
We have managed to achieve it by adding through UI, field for Users entity but we have no idea how to do it through migrations
Any hints?

[Author]

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