To get Billing date ,If record does not create on VBKD

Hi Experts

I was created Contract (VA41) that include

- item for Service Charge (has Billing Plan) and

- item for Other Charge (ref high level to Service Charge but doesn't have Billing Plan)

and I found that record of Other Charge does not create on Table "VBKD"

Then How can I find Billing Date for that item

PS. Why not that record created on VBKD cause incorrected configure or standard normally

Thanks you