VLD-1111 Mapping cannot be generated due to unknown step

Hi All,
Requirement : Mapping of Flat File to Oracle 9i Tables
My Flat File contains : Header Record & Detail Records
When I try to implement Sequences to identify parent child relationship between Header Record & detail Records
I get the above error.
Also I need to know how I can reject a file if Header Data is not available ?
Any tips on this will be higly appreciated.
Thanks in Advance.
Sohan.

Hi Igor,
Thanks for your reply.
But I face with this situation.
If you develop two different mappings then one part will generate SQL*Loader Code and the other part will generate PL/SQL Code.
If I try to upload the data without Sequences using SQL*Loader then all records will be rejected due to primary key constraint on the target table.
How the PL/SQL code generated for Sequences will be implemented in OWB if I create a separate mapping for sequences & What will be the execution plan for the codes generated by SQL*Loader & PL/SQL?
Regards,
Sohan.

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