Overlapping records are deleted or delimited

What causes this issue?

The table entry which you are processing is only valid between the
"Begin date" and "End date" which it contains. You have specified a
"Begin date" or an "End date" which does not lie in the validity range.
This extends the validity range. It must be ensured that the validity
ranges for entries with the same key do not overlap.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

If this warning is confirmed, all existing entries for the specified key
whose validity range lies completely inside the new validity range, are
deleted. If there are entries whose validity ranges overlap the new
validity range of the entry being processed, their validity ranges are
limited so that the validity ranges do not overlap.

How to fix this error?

Confirm the warning with <PF>ENTER</> or cancel the processing
with <LS>Cancel</> or <PF>F12</>.

Error message extract from SAP system. Copyright SAP SE.