Solution : https://service.sap.com/sap/support/notes/598691 (SAP Service marketplace login required)
Key words :
data import process terminates, transfer structureconvexit_io = infoobject conversion exit, 1 content import support package 5, 0b import support package 31, 1c import support package 23, 0b import support package 11, prerequisites additional checks, determine assigned fields, source system assigned, 0b support package 31
Related Notes :
| 559763 | Alpha conversion flag in transfer rules |
| 447341 | values for ALPHA conversion routine |