For position &1, &2, &3, period end was moved to &4

What causes this issue?

The displayed position cannot be evaluated at the end of the period,
either because there is no rate available or the position values are
zero. The period end is therefore shifted to the last day on which an
evaluation can take place.
If the period end should not be moved, you can set the "fixed period
end" indicator.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.