Solution : https://service.sap.com/sap/support/notes/443027 (SAP Service marketplace login required)
Key words : 
enter '281'                     matnr = material number                     werks = plant                     lgort = stock location                     erfmg = quantity                     erfme = unit                     gsber = business area                     nplnr = network number, t20 = normal / t40 = final                     arbpl = work center                     werks = plant                     aufnr = network number                     vornr = activity number                     budat = date, windows 'control panel' -> system -> advanced tab -> environmental variables -> user variables -> ps_trace = 1, windows 'control panel' -> system -> advanced tab -> environmental variables -> user variables -> ps_access_double_byte = 1, confirmed work                     ofmnw = remaining work                     ofmne = unit, enable double-byte character download double byte characters, frond-end workstation tab set, -transaction sm59 --> tcp/ip connections 1, interfaces      -> open project system, ps_trace=1 windows environment variable
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