or actually this should work:
| 0CALMONTH | 0CALMONTH2 | Current Year | Previous year | Previous year constant selection on 0CALMONTH = all | Previous year -1 constant selection on 0CALMONTH = all | CY | PY |
| hidden | hidden | hidden | hidden | hidden | |||
| 01/2014 | 01 | 100 | 80 | 70 | =current year + previous year | if current year <>0 use previous year constant selection if previous year <> 0 use previuos year -1 constant selection | |
| 12/2013 | 12 | 150 | 150 | 70 | =current year + previous year | if current year <>0 use previous year constant selection if previous year <> 0 use previuos year -1 constant selection |