Kind of a reach, but are you tracing?
https://metalink.oracle.com/metalink...,1,1,helvetica

Just for jollies, check MAX_TRANSACTION_BRANCHES and
DISTRIBUTED_TRANSACTIONS on the 8 side (though it looks like the 10
side is throwing the error - are you sure it doesn't have more links?).

I think you are going to have to have a 9 in between.

jg
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