Solution : https://service.sap.com/sap/support/notes/385524 (SAP Service marketplace login required)
Key words : 
short      delivery timemedium     delivery time-spotlong      delivery time-spotheading    delivery time-spot save, enter 'delivery time-spot', delivery time-spot, select radio button 'data type', additional key words transactions, short text field, tab page 'field label', attached source code corrections, select 'data element', choose button 'create'
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| 375193 | Backorder processing: Composite SAP note on posting |