Master Data Transformation Rule

Hello,

I have datapackage coming from a DataSource with this structure :

CostElement Type Group

NC1 T1 AS

NC1 T2 AS

NC2 T1 Purc

We want to make a transformation to a MasterData with this structure :

CostElment T1 T2 Group

NC1 Yes Yes AS

NC2 Yes -- Purc

Actual transformation is not managing double costelement, one of them is deleted.

Shall we add an end routine to this and if you have some code ?

Thanks