SSRS for Dynamics AX 2009 - Problems with totaling percentage

Hi everyone,

I'm pretty new to SSRS for AX so bear with me.

I got a problem with a report I'm working on. I have a matrix with column grouping on year and month, and row grouping with drill down on Purpose, ItemId and Item name. I have 3 data fields which shows the data for 1. delayed x days, 2. all orders, and 3. the delayed orders in percentage of all orders (I use an expression to calculate the percentage). The problem is that the totaling for percent is all wrong. If I drill down, it shows me the correct percentage for each delayed item. If I drill up again I can see the total for each Purpose, but it seems to total or calucalte percentage of all orders from delayed orders.

The report looks like this:

                                                                                               November                                               December

+Purpose      + ItemId      ItemName             Delayed days      All orders     Percentage        Delayed    All orders Percentage

Sales X             100               Chair                              0                      2                 0%                      0              12                0%

Sales Y             200               Table                              0                      1                 0%                      40             63            157,50%

Can somebody please tell me if there's possible to fix this?