Hi Kapil,
Business is mostly intrested to looks into details rather than summerising.
As Financial details can be derived from GL but it doesnot give itemwise details same as maintained in MM Conditions. To achive this MM Condition Type maaped with COPA Value Fields. i.e. Material Quantity, Gross Amount, Net Ammount, Cash Discount, Various Taxes, etc.
For Service PO, yes we can use KE4IM to Integrate MM & COPA. in that case you need to use Service Entry sheet ML81N to get Invoice & post COPA Doc.
Regards,
Rokky