Advance requirements - CX_ADVANCE_DEMAND
First the application head is created. If a part must already be ordered before order items are created due to scheduling constraints, an advance requirements item is created for this. The preliminary requirements header is initially only connected to the order header, as there are no order items yet.
The preliminary requirement items are processed as if they were order items themselves. This usually continues until they are staged. If the order is then processed further, the system recognizes when creating MRP that the parts have already been procured by an advance requirement and links the transactions together (green and blue lines, Successor/Predecessor, whereby the advance requirement item becomes the predecessor (in terms of time) of the order item, or the MRP created from it).
A link of a preliminary requirement to level 0 of an exploded order BOM is not planned.