https://bz.apache.org/bugzilla/show_bug.cgi?id=69324

--- Comment #2 from sfis...@gmail.com ---
PJF: to be fair, there are use cases where the spreadsheet being processed by
POI is treated as a System of Record, requiring POI to exercise calculations
after inputs are modified.

DR: part of what PJF is alluding to still holds though.  i ran across the same
issue sometime ago, and submitted a PR with the added functionality added. 
what you have come across is the generic "not yet implemented" error that
occurs when POI exercises a function that has not been implemented yet.  there
are two ways to attack this:

1) there is a mechanism to "patch" the functional dictionary at runtime.  you
can do this but depending on the function in question, it can require a fair
bit of baggage code (some of the functions rely on package protected/private
semantics which i found infuriating, but that is a discussion for another day
with a beer in hand)

2) you can submit a PR and have someone (more than likely PJF) review and
merge.

caveat emptor
YMMV
void where prohibited by law
past gains are no guarantee of future returns

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