The griddisks associated to the "DATA" diskgroup are not evenly balanced, FREE_MB shows an uneven size:
In order to solve this problem please execute the next steps:
1) Please manually rebalance the "DATA" diskgroup as follows:
SQL> alter diskgroup DATA check all repair;
SQL> alter diskgroup DATA rebalance power 32;
2) Wait until the rebalance operation completes:
SQL> select * form gv$asm_operation;
3) Then create the tablespace as follows:
SQL> CREATE BIGFILE TEMPORARY TABLESPACE TEMP_APP TEMPFILE '+DATA' SIZE 10g autoextend on next 1g maxsize 50g;