3684787 - The requirement document Items are not copied to the planned Capacity document

There is a requirement document (for example a Freight Unit [FU]) and a planning happens to a capacity document (for example to a Container Unit [CU]). The capacity document's Items tab is empty, there is no items and products are seen from the requirement document. 

• SAP Transportation Management 9.x
• SAP S/4HANA 1709+

Organization Interaction Status, stage, product, freight unit, container unit, Not Yet Requested, To Be Checked , Rejected , confirmed , /SCMTMS/CL_TOR_HELPER_STAGE , FILTER_UNCONFIRMED_STAGE_STOPS, empty Items tab, items , KBA , TM-PLN-TU , Transportation Unit , TM-PLN , Planning , TM-FRM , Freight Order Management , Problem