Multiple items in same year by same author not listed correctly

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Hello All,

I have another problem. I expect to have: Hao et al., 2016a,b and I have Hao et al., 2016a; Hao et al., 2016b. In the ‘Citations-Author Name’ I have marked: ‘Omit repeated authors (e.g.Smith, 1999, 2000)’ - but unfortunatly it does not work.

Any idea what I’m doing wrong?

Thank you for any help.