Could you let us know hwat version of PADS you are using?
Thank you in advance.
Are you annotating common properties to selected symbol on Block schematic (schematic under Blocks section in Navigator) or directly in Board design schematic (schematic under Boards section in Navigator)?
When you annotate symbol on Block Schematic DxDataBook modifies block level value (of DEVICE property or any other property), howvwer instance of particular symbol existing in Block schematic in Board design (top schematic) ca have instance level value which overwrites symbol and block level values.
If DxDataBook operates on Board design level and if instance level value exists it is replaced.
Example (DEVICE 10-00070-00 is replaced by 10-00071-00):
If I am not right, it may be specific case which should be investigate by Customer Support.