ORA-14006 Invalid Partition Name on alter table...truncate partition

It's got to be something obvious, which would make this an embarassingly naive question, but, here goes.=20

I've got a table "tab" and a partition "part"

i do alter table tab truncate partition (part);

i get, repeatedly, ORA-14006, invalid partition name

I am logged in as the schema owner, i have tried every (well, a lot) permutation of pre/post parenthetical spacing,=20 capitalization, i've tried pulling the partititon name using dynamic SQL to account for hidden control chars, there are no visitors in v$transaction, redo is quiescent, the dba_TAB_PARtitions tables shows the partitions as named, and = dbms_space_admin.tablespace_verify
on the relevant tspaces is OK ( "completed succesfully" )=20

I've opened a tar, but...this should be easy, and I am=20 plumb out of ideas.=20

Oh, yea, forgot to mention. If we don't get this solved in the next coupla hours, we've got a major failed migration on our hands.=20

Any help really welcome.=20

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