Extended Rebate Split based on Material

Dear Experts,

My rebate agreement is based on Product hierarchy which spans across multiple materials.The business requirement is to have the material number on the final settlement credit note so that the correct profit center on the material master is affected. So, I have opted for MATNR in the VAKEY setup

I have setup VAKEY for Extended Rebates as below.

KUNRG

MATNR

WERKS

ITEM CAT.

Now, When I am doing the final settlement, I am getting the required material number. But the rebate credit memo (B1E) is splitting for each material. A new credit memo is being created for different material. However, the desired solution is to have multiple materials in one credit memo unless it is a different payer.

Will the usage of a new data transfer routine in VTFA solve my issue if I try to consolidate based on Scale group field on the rebate agreement?

Thanks in advance for the suggestions.