Hello Pravin,
For a straight answer the scenario should be very detailed, debugging session assist a lot but
it is not possible to debug for you via forum.
If there are different Header fields or different header partners, then the split is justified. See the SAP note 11162. You just need to trace
where values come from in order they don't differ.
Note 1561427 contains precious information on structures, user-exits etc you can make use
for splits.
I recommend you get familiar with those notes find out the solution on the specific
fields involved.
Best Regards,
Christian Rosa