Process chain for updating a cube with last month's data everyday.

Hi everybody,
I need a suggestion on designing the process chain. I have the cube Zxx_xx. I will explain my requirement with an example. Suppose I uploaded the cube with data up to 201103. Each night in May, I want to upload the cube with April's data. So each night the previous request should be deleted. When May finishes, this time, each night I need to upload the cube with May's data. I handled everything except deleting the data from PSA. I need the data loaded in the cube stay at PSA. In this case the request including data till 201103, the request loaded for April, and finally in June, I need to see the request loaded for May. In the last step of the process chain I added the process for deleting PSA data choosing my infosource, but I have no option for deleting the requests where I have uploaded from same infopackage with same selections. Please help handling this situation.
thanks in advance.
Yasemin.

hi,
You can achieve this by loading the cube through two different DTP's.
DTP1 to have in the routine to pick data for month-2 i.e. in june it picks up April data.
DTP2 to restrict the month in routine to month-1 i.e. in june it picks up May data.
Now the design of process chain will be as follows:
process chain to have an step "Decision Between Multiple Alternatives "
in this decision step you can write formula to check if sy-datum is 01, first of every month.
if step: formula
( RIGHT( 2, Current Date ) = '01' )
On first of every month load for month-2 as well as month-1 and delete overlapping request for month-1. Variant described below. DTP1, DTP2 and then Delete overlapping request step
Else part of Decision Between Multiple Alternatives will be executed for all other days
load only month-1 and delete overlapping request from cube. DTP2 and then Delete overlapping request step.
in the pc there is variant "Delete overlapping request"
in that choose variant type DTP, give the technical name of DTP2 and save it.
this way the whole data loading will be automated and you need not intervene to delete data manually,
regards,
Arvind.

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