1. Partition P1 with fact table F1 is merged into partition P2 with
fact table F2
2. In the underlying database, F1 data is copied over to F2 and then
F1 is dropped
3. Drillthrough fails with a data provider error that F1 is missing

Why is drillthrough looking at the old table (F1) when the new
partition's fact table is F2 ?
Searching the OlapObjects repository, there are no references to F1 at
all. Mysterious??