It's certainly a beautiful and tough rose, except perhaps for the blackspot susceptibility. I don't know why Aicha is reluctant to accept pollen from other roses. I have the impression that species roses (and apparently hybrids close to species) often are reluctant to accept pollen from modern hybrids, and work better as pollen parent. Someone else may know better. I haven't used Aicha as pollen parent extensively, but I thinks it's fertile.