& initial; currency amount & in & was passed without a currency

What causes this issue?

The currency amount &v2& in field &v3& should be converted into the
external or internal data format (as appropriate). However, the amount
in field &v1& is an initial value. A currency amount without a currency
cannot be interpreted.

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?

Error message extract from SAP system. Copyright SAP SE.