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Two step entity reference selection

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I want to create a two step entity reference selection in Drupal 9.

The structure so far:

Content Type: Company

--> Entity reference: Jobs (multiple)

Content Type: Job

--> Entity reference: Qualification (multiple)

Content Type: Qualification

I created an import for the company profiles and there is a entity reference for multiple jobs. This is already working.

In a second step there should be a selection of qualifications within the company profile. But this selection should be limited to the qualifications defined by the relation between job and qualification.

I was looking for a structure like this:

form structure

I already tested the Business Rules and Conditional fields modules. But the problem is these solutions base on a single selection in the first step. I have a multiple selection in the first step (jobs).

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