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What this error means

FOREIGN_KEYS_REFERENCED_VIEW means a foreign key references a view. A common underlying message is: 
table `posts` foreign key references view `active_users`

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Why PlanetScale rejects it

MySQL foreign key constraints must reference real base tables. A view is a stored query, not a table that can enforce referential integrity.

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How to fix it

Reference the underlying table instead of the view, or remove the foreign key constraint and enforce the relationship in application code. Invalid: 
CREATE VIEW active_users AS
SELECT id FROM users WHERE active = 1;

CREATE TABLE posts (
  id bigint unsigned NOT NULL,
  author_id bigint unsigned NOT NULL,
  PRIMARY KEY (id),
  CONSTRAINT posts_author_fk FOREIGN KEY (author_id) REFERENCES active_users(id)
);
Valid table reference: 
CREATE TABLE posts (
  id bigint unsigned NOT NULL,
  author_id bigint unsigned NOT NULL,
  PRIMARY KEY (id),
  CONSTRAINT posts_author_fk FOREIGN KEY (author_id) REFERENCES users(id)
);

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