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*****  ALWAYS BACK UP A DBC BEFORE MANUALLY EDITING IT  *******
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^ that's my disclaimer...

Try Validating and cleaning up the database first. Then try adding your table again. If that still fails...

open the DBC as a table: USE mydbc.dbc EXCL

find the offending record and mark it deleted.

pack it and try adding your table.

good luck.

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*****  ALWAYS BACK UP A DBC BEFORE MANUALLY EDITING IT  *******
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HTH