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ADF : Pojo Data Control : structure definition does not have a primary key attribute

I had a minor difficulty with creating a POJO data control today.

The create data control failed with the following error: structure definition does not have a primary key attribute
Fixed the package problem (DC java file resided in a package different from what was specified in the package section inside the java class)

Not a very clear error indeed, note to self don't make stupid errors.
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