2N Omega Lite - Configuration Tool manual v1.8 - Manual (Page 98)

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-after clicking Open, the abbreviated dialling is imported.
2.14.3. Errors during Abbreviated dialling Import
If a file with abbreviated dialling records is not correctly created or contains
higher number of records, a note is displayed.
-this note means, that the file contains higher number of records, then it is
possible to write in the assigned memory space. This can happen if you try to
Import Common abbreviated dialling into memory space reserved for Private
abbreviated dialling.