I would not expect Copy/Paste to overwrite the Schedule Table Style in the target drawing file, but Style Manager should ask if you want to overwrite the existing style or not.
Question: What changes are you making? If you are adding one or more columns to the Schedule Table Style, and those columns are referencing properties that have been newly added to a Property Set Definition in the source file, and that Property Set Definition already exists in the target file, but without those new properties, then you need to copy the Property Set Definition to the target file first, and then copy the revised Schedule Table Style.
If you copy a Schedule Table Style to a drawing that does not have any of the referenced Property Set Definitions, ACA will copy those Property Set Definitions, too. But if the referenced Property Set Definitions are already there (same name, but an older version), it will not copy them. It will overwrite the Schedule Table Style, but when it sees that there are columns that reference Properties that do not exist in the target file, it will remove them. If those are your only changes, it will appear as though the Schedule Table Style was not updated.
David Koch
AutoCAD Architecture and Revit User
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