SAP Message VT825 - Relevant billing type for correctin must be: Relevant to rebate ='B'

Diagnosis
The billing type, with which the rebate request is billed, must havethe following settings in Customizing:
Rebate settlement = 'B'
The following settings must be made for the relevant billing document,for example for correction:
Rebate settlement = 'B'
Select Subject to volume-based rebate indicator