Panasonic KX-T336 System Reference Manual page 1386

Each entry should always include the extension number.
For example, entering: DIC>APPEND /Jack/Sales displays an error
message.
Be sure not to leave a space within a sub command.
For example, entering: DIC>APPEND 1001/Jack Smith/Sales
displays an error message. Instead of a space, special characters
such as "-" can be used to separate words as "Jack-Smith."
The same extension number can be registered in the multiple
number of entries if extension name and/or department name
are/is different.
Displayed Message
Displayed Message
Error: Illegal main command
*****
Error: Illegal sub command
*****
Error: Input data already exist
*****
Append complete
*****
Error: Append deny (already 500 data
*****
entry)
There is an error in the main command.
There is an error in the sub command.
Entered data has already been stored.
Storing is completed.
500 data entries have already been stored.
13-B-3
Meaning