Not sure whether or not this is done on purpose, but in rules.install there are schema definitions which define foreign keys in a way that differs from the way Schema API documentation proposes:

'foreign keys': An associative array of relations ('my_relation' => specification). Each specification is an array containing the name of the referenced table ('table'), and an array of column mappings ('columns'). Column mappings are defined by key pairs ('source_column' => 'referenced_column').

Files: 
CommentFileSizeAuthor
rules-incorrect_foreign_key_definition_in_schema.patch2.02 KBxatoo
PASSED: [[SimpleTest]]: [MySQL] 328 pass(es).
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Status:Needs review» Fixed

Thanks, committed.

Status:Fixed» Closed (fixed)

Automatically closed -- issue fixed for 2 weeks with no activity.