multiple outer joins - how does that work ?

[akhadar]

Specify only one outer join (+) to this table, then retry the
operation.

"In a query that performs outer joins of more than two pairs of tables, a single table can be the NULL-generated table for only one other table. For this reason, you cannot apply the (+) operator to columns of B in the join condition for A and B and the join condition for B and C."