Sub Contract PO - Difference between New PO and Change PO (PORDCR1 ->RON)

Hello There:

We are using Purchase Order Collaboration with Contract Manufacturing.

We create a new PO in ECC. IDOC PORDCR1.PORDCR102 is then transformed to RON.

When we change the PO in ECC it sends out the same IDOC PORDCR1.PORDCR102 and creates RON which is fine.

When we did a difference between these 2 files, only the create date/time and what I changed on the PO is different.

Is there any kind of flag we could set in ECC that would distingiush these same IDOCs for a new PO versus changed PO?

Thanks in Advance

Vivek