Solution : https://service.sap.com/sap/support/notes/121906 (SAP Service marketplace login required)
Key words : 
dtypelgth  short text   clint           clint           numc10 internal class number  lnpos           vtlin           numc5 line number, characteristics planning  aterf           aterf           char1 entry required  updkz           updkz_d         char1 update indicator 4, aenam              aenam            char     12 laeda              laeda            dats      8 datuv              datuv            dats      8 3, enter menumdpp               source language de               target language en 8, enter data element atpkt                  vbobl                  atopt                   atnrl 4, variant table  pl_rel          pl_rel          char1 relevant, key  data element     dtype   length mandt, vtlin            numc      5 pl_rel             pl_rel           char      1, translation ->short text-> user interface->interfaces 7, ~ftp/general/r3server/abap/note
Related Notes : 
       
| 206363 | Modeling for the planning variant (documentation) | 
| 123160 | 40B: Search of planning variant in the configurator |