Currency &1 is only valid until &4

What causes this issue?

Currency &V1& is valid for country &V2& from &V3& to &V4&, according to
the table of valid country currencies.
The current record begins in the validity period; it ends in a period
in which the currency is delimited and not valid anymore.

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?

Check your entries.
It is useful to create records that fall after the last conversion
date. These records must, however, be converted before the currency is
discontinued.

Procedure for System Administrators

Check the setting in the table of valid country currencies (T500W).

Error message extract from SAP system. Copyright SAP SE.