Mapping Problem SAP PI 7.1

Hello!

I am struggling with a sales order mapping:

My source and target structure:

My source data (just the content of fields KdNr, Auftrag, Posnr, Artnr, Liefermenge as an example):

01,1000,1,100,A,10

02,1001,1,100,A,10     -> KdNr "02" and Auftrag "1001"

02,1001,2,200,B,10     -> also KdNr "02" and Auftrag "1001" but pos. 2 of the order

03,1002,1,100,A,10

04,1003,1,100,A,10

05,1004,1,100,A,10

My goal:

a) 1 Recordset per KdNr (customer number) and

b) if a source Recordset has 2 or more positions (like 02,1001,1,100,A,10 and 02,1001,2,200,B,10) these positions should be mapped together in one Recordset in the target message.

So the output should be:

Recordset 1 with 1 position

Recordset 2 with 2 positions

Recordset 3 with 1 position

Recordset 4 with 1 position

Recordset 5 with 1 position

Does anyone know how to solve this problem?

Thanks in advance and all the best for 2015!

Regards

Christian