Solution : https://service.sap.com/sap/support/notes/67915 (SAP Service marketplace login required)
Key words :
text 'adjust actual data proportions' appears, text 'adjust actual data proportions', 'adjust plng hierarchy proportions', additional key words mc8u, choose 'edit' -> 'delete block', choose 'transaction code' -> 'change', 'field text' field, choose 'edit' -> 'attributes, screen painter appears, select 'fullscreen editor'
Related Notes :
| 89473 | Lvl-by-lvl planning: proport. for info structure |
| 82745 | Explanations on the 'Calculate proportions' funct. |
| 63180 | Adjustment of plan.hierar.proportions does not work |