Need help in mapping

Dear Friends,

I have a source structure in this format

IDOC(1..1)

NODE1(1..N)

FIELD1

NODE2(1..N)

FIELD2

NODE3(1..N)

FIELD3

NODE4(1..N)

FIELD4

Bascially, NODE 2,3, 4 are at the child nodes of NODE 1.

I have to map the fields, FIELD2,FIELD3, FIELD4 to a simple xml structure in the target.

The mapping is working fine, when NODE2,3 and 4 are occurring once and it fails when they repeat.

I have to pick up the FIELD element from the corresponding NODE and then populate it in the target structure.

Pls help me in this regard or share some good links that can help me how to do this mapping.

Thanks you so much.

Regards,

Jack.