INNER JOINS in 7.0.3 & 7.1.3

I have a DB in 7.1.3 that I am trying to downgrade to 7.0.3, and I've run
into a little problem with INNER JOINS.

This query (just as an example) causes an error :

SELECT a.name as hometeam, c.name as homemanager, c.email as homeemail,
b.name as awayteam, d.name as awaymanager, d.email as awayemail FROM teams AS
a INNER JOIN managers AS c ON (a.managerid = c.managerid), teams AS b INNER
JOIN managers as d ON (b.managerid = d.managerid) where a.teamid = 13 AND
b.teamid = 15;

The error being:
ERROR: parser: parse error at or near ","

A query with a single inner join works fine. I've checked the changes file
for 7.1 on the website, but I can't find INNER JOINS mentioned as being
something that changed.

Can anyone shed any light on this for me?

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