Unable to process cash flow type '&' for warrant bonds

What causes this issue?

Within gap analysis, the system encountered a cash flow type which
cannot be used for warrant bonds.
The cash flow type is: '&V1&'.
The identity of the warrant bonds is contained in the next error
message.

System Response

The cash flow for these warrant bonds is not fully analyzed. The
analysis results therefore do not contain all the data.

How to fix this error?

A customizing error is indicated. Check the assignment of flow types
for the cash flow indicator.

Error message extract from SAP system. Copyright SAP SE.