Oracle Database, SQL Language Reference 19c E96310-11 August 2021

CREATE TABLESPACE documentation (15 SQL Statements, CREATE TABLESPACE) says that:
'Use the storage_clause to specify storage parameters for all objects created in the tablespace. This clause is not valid for a temporary tablespace or a locally managed tablespace. For a dictionary-managed tablespace, you can specify the following storage parameters with this clause: ENCRYPT, INITIAL, NEXT, MINEXTENTS, MAXEXTENTS, MAXSIZE, and PCTINCREASE. Refer to storage_clause for more information.'

when storage_clause documentation (8 Common SQL DDL Clauses, storage_clause) says that:
'The specification of storage parameters for objects in locally managed tablespaces is supported for backward compatibility. If you are using locally managed tablespaces, then you can omit these storage parameter when creating objects in those tablespaces.'

but later it states that:

'The storage_clause is interpreted differently for locally managed tablespaces. For locally managed tablespaces, Oracle Database uses INITIAL, NEXT, PCTINCREASE, and MINEXTENTS to compute how many extents are allocated when the object is first created. After object creation, these parameters are ignored. For more information, see CREATE TABLESPACE.'

-----

I'm little confused here. Could you clarify it? Now it looks like CREATE TABLESPACE points to storage_clause for more information and storage_clause points back to CREATE TABLESPACE for more information? Moreover CREATE TABLESPACE says that in locally managed tablespaces it it unsupported when storage_clause says something different.

SQL> create tablespace demo datafile 'X:\ORACLE\ORADATA\DB19\PDB1\DEMO.DBF'
  2  storage ( initial 2m next 10m);
storage ( initial 2m next 10m)
*
ERROR at line 2:
ORA-02180: invalid option for CREATE TABLESPACE

SQL> create tablespace demo datafile 'X:\ORACLE\ORADATA\DB19\PDB1\DEMO.DBF' size 200m
  2  extent management local
  3  uniform size 4m;

Tablespace created.

SQL> create table QQ ( x int ) storage ( initial 13m next 5m ) tablespace demo;

Table created.

SQL> insert into QQ values (1) ;

1 row created.

SQL> commit;

Commit complete.

SQL> select bytes from dba_extents
  2  where segment_name = 'QQ';

     BYTES
----------
   4194304
   4194304
   4194304
   4194304