Martialnote"The end date must be on or after the start date."
Where: New subscription and Edit subscription sheets, End (optional) or Expiry (optional) fields (owner).
Why: the end or expiry date is before the start date. The start day itself is allowed (one-day subscription).
What to do: choose a date on or after the Start. Leave the field empty for a subscription with no end or a card with no expiry.
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