Recoding was not carried out.
There is a mix of levels in vocational (code 2), as it could be both low or medium.
Since 30 percent of the population is concerned, LIS decided not to recode.

If LIS users want to pursue a recode they may do so on their own responsability.
The mapping below may serve as suggestion. 
The problematic category is pointed out.

PEDUC							     ISCED97	   LIS recode
  1  basic, elementary								1
  2  vocational									1 or 2 ?
  3  secondary, prof 8,9 + 2 years						2
  4  secondary, prof 8,9 + 4 years						2
  5  secondary general 8,9 + 3/4 years						2
  6  university									3
  7  no school education							1
  8  children 15 years and younger						9