DQM-DMR -Lag

[Cognos8]

I have Year and month in 2 different dimensions. two prompts are used  for this. To display the previous member of year
i am using lag function. Lag function work separately. expected output is below. Since the previous year has 2014
and year column have 2014 in same row, output of query shows empty.

Model = DQM - DMR  model

Year  Month    Previous year
====  =====    ============
2015  January  2014

[MFGF]

I have Year and month in 2 different dimensions. two prompts are used  for this. To display the previous member of year
i am using lag function. Lag function work separately. expected output is below. Since the previous year has 2014
and year column have 2014 in same row, output of query shows empty.

Model = DQM - DMR  model

Year  Month    Previous year
====  =====    ============
2015  January  2014

List or crosstab? I'd expect a list to behave as above as it's one-dimensional. A crosstab should display both years quite happily though.

MF.