Quotation of bond cum and ex is different

What causes this issue?

The quotation of bond cum &V1& is different from that of bond ex &V2&.
This is not permitted. Both bonds must either be unit-quoted or
percentage-quoted.

System Response

The function cannot be executed.

How to fix this error?

Check the quotation of the bond cum/ex.

Error message extract from SAP system. Copyright SAP SE.