Diagnosis
When entering the validity, you must take the following into account:

• The new valid-to date of the current expense that is being ended
has to be one day before the new valid-from date of the newexpense (that is, no gaps are allowed in the definition of thevalidity).

• The new valid-to date of a current expense that is being ended
must always be after the current valid-to date of the currentexpense.

• The new valid-from date is not allowed to be before the start of
the cost efficiency analysis.

• The new valid-to date is not allowed to be after the end of the
cost efficiency analysis.