Info structure &1 is not in any update!

What causes this issue?

Info structure &v1& is not assigned to an update group.

System Response

If no update group is defined for the confirmed order quantity of the
schedule lines, then the checking date from the update rule can not be
determined.
Product allocation can not be carried out.

How to fix this error?

Assign the info structure to an update group and define an update rule
for the order entry quantity.
Check the settings for the update group and the statistics groups for
customers and materials

Error message extract from SAP system. Copyright SAP SE.