Link Sales Order to Assembly

Current: When a SO is raised and there isn't enough stock, the user can set the SO to “Backordered” then raise an Assembly either in bulk via “reorder backorder” or manually. 

Issues: Both ways don't reflect within the SO, that a specific next step (FG or PO) has been raised to fulfill the backordered SO. The user has to search for the SO number within the FGs to find the relation. User has to check manually when SO receives its backorder and SO can be progressed.

Enhancement: Add a link on any SO with status “backordered”, that allows the user to raise an FG or PO straight from the SO. Display status of FG/ PO on SO. 

Nice to have: Once the FG/PO is completed, SO status changes to “Ready for pick” or similar. SO can then be progressed.