Extension of idoctype pordcr103 with z segments for message type pordcr1

Hi all,

We are using the message type PORDCR1 And Basic type PORDCR103 with business object BUS2012 and ALE_PO_CREATE1 outbound function module to create the idoc.

My requirement is to add the custom segments in ALE_PO_CREATE1 outbound function module to extend the PORDCR103 idoc type.Please let me know the where to add code for filling custom segments in ALE_PO_CREATE1 function module.

Best regards

Gnt