Fixed Item Quantity and rounding with quantity optimiz. not possible

What causes this issue?

The rounding indicator for the current item is <LS>Quantity Optimization
</>, and <LS>Fixed Item Quantity</> was selected as a parameter.
You cannot select this combination, however, because the outbound
quantity of the item may not be reached during quantity optimization due
to the rounding rules.

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?

Either remove the <LS>Fixed Item Quantity</> flag to execute the
allocation strategy or cancel the allocation strategy, change the
rounding indicator in the item details, and execute the allocation
strategy again.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.