Solution : https://service.sap.com/sap/support/notes/393339 (SAP Service marketplace login required)
Key words :
system generates message c2305 'order &1, additional key words cor2, setting status clsds, production order network, set status clsd, clsd status, leading order, dlfl status, imported network, deletion flag
Related Notes :
410112 | Order can be closed, although dependent order is active |
402594 | COHV: C2305 when closing production order |
396673 | C2305 when closing or setting deletion flag |
373506 | |
371564 |