What is your SAP_BASIS release level, are you already on 7.40 SP xx ?
Adding to what Adi found out, you might run into the strict mode because you have a cascading left join, which still produces an error in my old 7.31 box here.
Can there really be a BUT020 entry without the corresponding ADRC entry? I think not, so you could try to change the second LEFT JOIN to a "normal" JOIN and see if this helps.
Or just try adding the freakin' commas as suggested (and reported by your initial error message) 
Thomas