Solution : https://service.sap.com/sap/support/notes/525358 (SAP Service marketplace login required)
Key words :
menu path 'edit -> show/hide -> show relationship', 'pressed' icon 'switch connect mode, indicator 'show relationship', planning board profile, newly created relationships, project planning board, attached program corrections, planning board, project builder, program error
Related Notes :
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| 450371 | Icons 'Connect mode on' for CN22 Gantt chart is missing |