2559746 - System Triggers Error Message when Customer Demand is Released "Sales Order XX item YY not released; not all items of delivery grp are confirmed"

A sales order with multiple line items among, it only has one line item with green ATP status while the others have red ATP status. In the sales order, it has been selected the 'Complete Delivery' checkbox and assumed its should not be visible in the customer demand unless all the line items have green ATP status.

When releasing this customer demand, the following error occurs:
-Sales Order item not released; not all items of delivery grp are confirmed

SAP Business ByDesign

Sales Order, Complete Delivery Check, Uncheck Complete Delivery Checkbox,  Sales Order item, not released, not all items of delivery grp are confirmed, customer demand delivery grp are confirmed, sales order item not released , KBA , AP-CR-CR , Customer Requirement , Problem