Solution : https://service.sap.com/sap/support/notes/1340663 (SAP Service marketplace login required)
Key words :
set component 'null_as_blank', field catalog implementation, transaction dialog box, null_as_blank type wdy_attrform_null4, retain leading zeros, leading zeros reason, leading zeros, symptom powl, result list, terms powl
Related Notes :
| 1339510 | WD ABAP ALV leading zeros are not displayed |