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In the handbook, five regions are always written.
2008 there is a comment made on a proposal of the sixth region. But then it is no longer mentioned in the manual, although the term Diaspoa is still used more often.
This 1998 paper[1] and this 1999 official document[2] put Rwanda in the Central Africa group. (There are also older documents that do the same.)
Then this 2004 official document,[3] this 2005 official document,[4] this 2006 official document,[5] and this 2007 official document[6] put Rwanda in the Eastern Africa group. (The African Union's website also does this, but it has only clearly listed groups starting in 2019.)
However, this 2006 official document[7] states that only three countries have ever changed groups, which doesn't match because the actual number should be four (see main article for dates and references of the others).
In addition, this 2009 third-party publication[8] puts Rwanda in the Central Africa group again.
As a hard cut-off, in 2013 Rwanda took the Eastern Africa seat on the UN Security Council.
I cannot find any official documents saying what date the change occurred, nor any documents explicitly saying what group Rwanda was in between the end of 1999 and the beginning of 2004. I'm guessing it occurred between 2001-2002 though at the same time Rwanda changed its flag and anthem.
In the main article, I'm ignoring the 2006 contradictory official document as well as the 2009 publication, because (1) it's easier for a third party to make a mistake or assume that countries can't change groups (after all, this page did just that until 2024), and (2) if one official document must be wrong, it's easier to miscount historical changes than it is to literally print Rwanda being in the wrong group. Adding all of the above to the article would make a huge amount of clutter.