Diagnosis
Data extractors consist of two parts:

• A key extractor for determining the key values of the header table.


• A data extractor that returns the data of all supported tables
beginning with the key values.
Both extractors consist of two modules (an initialization module and amodule for determining the next data). An initialization module was notcalled in your application.

System Response
Correct your program so that the initialization modules are alsocalled.