Hi Nayeem,
Thanks for the reply, I had the same information earlier.
Nevertheless, we have to attach the DIRs to the header level of Purchase Order & Purchase Contract.
Before we do the ABAP development, it's required to do this configuration of 'Maintain Key Fields'.
And here we're stuck. Since we're not sure what values are to be used in this 'Maintain Key Fields' customizing.
Anyways, thanks for the response.
Cheers,
Tushar.