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The author has noticed a faulty argument in his paper [1]; it occurs on p. 85 and requires the following changes:
At the end of line 9, for (Qi)i=1,2,… read (Qi)i ∈ I; in line 10, the equation should read 
; lines 15 to 20 should be replaced by the following: then there exists some n–tuple δ = (δ1, …, δn) such that for every io there exists i ≥ io with εi = δ. Then δ1a1, …, δnan are positively independent over Q; for if rj ∈ PR and 
then there exists io such that 
, and for appropriate i ≥ io it follows that rj = 0 for j = 1, …, n.