That report run on the Item Journal Line table. I would create a new flowfield on that table, here’s the calculation formula:
CalcFormula = – Sum(“Reservation Entry”.”Quantity (Base)” WHERE(“Item No.” = FIELD(“No.”),
“Source Type” = CONST(37),
“Source Subtype” = CONST(“1”),
“Reservation Status” = CONST(Reservation),
“Location Code” = FIELD(“Location Filter”),
“Variant Code” = FIELD(“Variant Filter”),
“Shipment Date” = FIELD(“Date Filter”)));