Contract with Multiple Invoices

Dear All,

We have a requirement from business that we do contract to Invoice scenario where we need to genarate multiple invoices using billing plan.

It is working fine when we have multiple milestones at item level billing plan and accordingly invoices are getting generated.

But as per the client requirement, 1 milestone they would have split to multiple invoices.

Example:

1 WBS element has 3 mile stones

1st Mile stone 2000 User wants this to split 60% means 1200 USD and 40% means 800 INR and two invoices should get generated each.

2nd Mile stone 3000 User wants this to split 60% means 1800 USD and 40% to 1200 INR and two invoices should get generated each.

Please advise how to acheive this. I checked VTFA Copy controls and unable to do this scenario. Does it requires ABAP help?

Thanks so much!

Vamsi