Mapping Logic to produce the requirement

Hi Experts,

I have recently joined SAP world and that to in SAP PI development.I need your help and support so that I can learn.

I have a requirement and scenerio is FILE(CSV) to FILE (CSV) in which file have 2 field  with first row as header and in target field i have to skip the header and after doing that values needs to be sort in asscending order.

Source Structure

ItemCode     ItemType

876               Tea

564               Coffee

453               Colddrink

876               Tea

Target Structure

IteamCode ItemType

453            Colddrink

564              Coffee

876              Tea

876              Tea

Value can come twice in source structure.Please guide me.

Thanks,

Ravi Boppanna