Diagnosis
You have attempted to restrict the validity period of a standard usageof an address type. This is not possible in this case because thereare several possible successors for the standard usage.

System Response
Error message

Procedure
First establish the new standard usage from among the remainingusages for the address type, by extending its validity periodcorrespondingly.

Procedure for System Administration
The validity of a standard usage can be restricted if

• No other usage for the address type exists in the resulting temporal
gap or

• If exactly one other usage exists within this temporal gap.

This then automatically replaces the current standard usage.