Please enter order quantity in quantity field of the same name

What causes this issue?

You tried to enter a target quantity for an item relevant for delivery.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

For items relevant for delivery, the order quantity forms the basis for
the quantity field.

How to fix this error?

To create items relevant for delivery in service contracts, you use the
change to double spaced entry option. There you can enter your data in
the 'Order quantity' field.

Error message extract from SAP system. Copyright SAP SE.