Element Entry End date should be element entry start date

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Hi Experts,

We want to create element entry values for a non-recurring element with start date  = end date.

This works for some assignments, but for others the end date is automatically set to the end of the month (for the same element, and thus also same LDG).

Any idea what might be causing this and how we can make sure the end date for this element is always equal to the start date?

Thank you,

Ann