Avaya Partner 18 Connection Manual page 284

Troubleshooting
Problem 3: AT&TSet gives you an error message while programming
your telephone (Attempt to replace feature X with feature Y
failed. . .)
This error occurs whenever AT&TSet attempts to program a particular feature
and the PARTNER system does not permit the operation to take place.
Generally, AT&TSet knows which operation the PARTNER system will permit
and which it will not, and you will generally not be able to select invalid
features for a given button. However, if your telephone's programming has
been changed by any other means than using AT&TSet, it is possible that
AT&TSet's image of your telephone's programming has become outdated, and
operations which AT&TSet thinks are permissible based on its outdated image
may not be permissible when attempted on the telephone. For example, if your
System Manager may have added an extra line appearance to your telephone
using the PARTNER system's Centralized Telephone programming
capabilities.
If this error occurs, you may continue programming your telephone or cancel
the programming operation altogether. In most cases, the safest thing to do is
to cancel the operation and then select Read from Telephone from the File
menu. This operation will refresh AT&TSet's image of your telephone, which
should prevent programming problems in the future.
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