Error throw on exam loading

[Ghislain Hachey]

As reported by users.

Error Processing File

Violation of PRIMARY KEY constraint 'PK_ExamCandidates'. Cannot insert duplicate key in object 'dbo.ExamCandidates'. The duplicate key value is (1f70c317-7c30-44ae-b464-45cafc559805)

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[Ghislain Hachey]

Fix done in SQL and workaround explained in the stored procedure [pExamWrite].[LoadSoeExam] (snipper shown below).

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