Constraints with Excel

Question

Is it possible to use constraints with an Excel source? I have defined a constraint on the source table, and if I open the constraint, go to the control tab, and click 'check', it shows 1 row not satisfying the constraint. However, when I execute my interface, there are no error rows.
Also - if I run Control->Check on my source table, I get the error message: com.sunopsis.tools.core.exception.SnpsSimpleMessageException: CKM not selected.
I do not know how (or if it's possible) to select a CKM for a specific source table.
Is the only way to run constraints against an Excel source to use an intermediate staging table?

Answer 1

What about this?
SQL> drop table tesst;
Table dropped.
SQL> create table tesst(
  2  a  varchar2(2),
  3  b  varchar2(2),
  4  check((a not in ('A','B','C') and b is not null) or
  5        (a in ('A','B','C') and b is null)));
Table created.
SQL> insert into tesst values('A',null);
1 row created.
SQL> insert into tesst values('B',null);
1 row created.
SQL> insert into tesst values('K',null);
insert into tesst values('K',null)
ERROR at line 1:
ORA-02290: check constraint (HR.SYS_C003056) violated
SQL> insert into tesst values('B',null);
1 row created.
SQL> insert into tesst values('K','Y');
1 row created.
SQL> insert into tesst values('H','M');
1 row created.
SQL> insert into tesst values('B','M');
insert into tesst values('B','M')
ERROR at line 1:
ORA-02290: check constraint (HR.SYS_C003056) violated