Using segment in DFKKOP during billing

Hi,

We want to fill the segment field in the table DFKKOP during the billing in ISU.

We want to use the segment used in the revenue entry (table DFKKOPK) and put it also in the DFKKOP. This segment is defined in the contract (table EVER)

In customizing we could only have the segment in the revenue entry.

is there an event or a way to have it also in the DFKKOP?

regards,

Amine.