Solution : https://service.sap.com/sap/support/notes/29377 (SAP Service marketplace login required)
Key words :
system variable sy-stepl, visible step loop line, input fields remain empty, function module field_exit_<data element, profile parameter abap/fieldexit =, active field exits refer, setting abap/field exit, step loop fields, abap dump error, 6c maintenance level
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