Rebate agreement type & not assigned to sales order type

What causes this issue?

No order type was assigned to rebate agreement type &V1&.

System Response

To be able to create a rebate credit memo or rebate correction, an
order type for credit memo and correction requests must exist. Without
this order type it is not possible to continue processing.

How to fix this error?

Contact your system administrator.
An order type for rebate credit memo and rebate correction must be
assigned to rebate agreement type &V1& in
<GL:Customizing>Customizing</>.

Error message extract from SAP system. Copyright SAP SE.