Just use a collection of REFerences:
INSERT INTO Ocurrences (
CCase,
/* ... Other column identifiers ..., */
oSpaces
) VALUES (
'abc',
/* ... Other column values ..., */
tSpace(
(SELECT REF(s) FROM spaces s WHERE s.intcode='1')
)
);
db<>fiddle here
As an aside, '20/02/2020' is not a DATE data-type, it is a string literal and relies on an implicit string-to-date conversion. This implicit conversion will fail if the user's NLS_DATE_FORMAT session parameter does not match your string's format and since any user can change their session parameters at any time then this is not something you should rely on.
Instead, you should use:
- A date literal
DATE '2020-02-20'; or
- An explicit conversion
TO_DATE('20/02/2020', 'DD-MM-YYYY').