Incorrect +/- sign rule found

What causes this issue?

In depreciation area &V2& for chart of depreciation &V1&, the
+/- sign rule for '&V3&' is incorrectly defined.
Only the signs '0', '-', '+' and '*' are allowed, however, the system
found the entry '&V4'.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Change the relevant settings in the Implementation Guide.

Error message extract from SAP system. Copyright SAP SE.