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Whenever you are creating or updating an emplyomentemployment, you have to specify the following properties:

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If a person has more than one employment, there is often a need to determinate its main employment. This is can be used in many places such as mappings. For example a Core Identity can have two emplyoments employments but you would like to provision its job title to a target system. In order to determinate the job title, the main employment is used.

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• Main Employment is set

• Order by

  • Valid From and not expired

  • Percentage

  • Has valid to

  • Valid to

  • Id

The actual implementation might clear up any remaining questions:

return employments
    .Where(a => a.EmploymentState.Id != (uint)CoreIdentityEmploymentStates.Deleted)
    .OrderByDescending(a => a.EmploymentState.Id)
    .ThenByDescending(a => a.MainEmployment)
    .ThenByDescending(a => a.ValidFrom <= DateTime.Now && (!a.ValidTo.HasValue || a.ValidTo.Value >= DateTime.Now.Date))
    .ThenByDescending(a => a.Percentage)
    .ThenBy(a => a.ValidFrom)
    .ThenBy(a => a.ValidTo.HasValue)
    .ThenBy(a => a.ValidTo)
    .ThenBy(a => a.Id);

For further information there are also how-tos related to this topic:

https://itsense.atlassian.net/l/cp/21118Xwy