Inbound Idoc Create/Change Purchase Order

Hi All,

I have to do a inbound Idoc scenario for create as well as change Purchase Order.

Which is the IDoc type for Create/Change purchase order.

I went through this form found that ORDERS05 can be used but I am not sure this can be used for both create as well change Purchase Order.

If ORDERS05 can be used then which is Process code,Function Module and Message type for both create and change Purchase order.

I also found that IDoc type PORDCR102 can be used for  create Purchase order and PORDCH02 can be used for change Purchase order,but i don't want to use two Idoc types.

Please suggest.

Thanks in advance.

Regards,

John