awk -v str="MANDT SERAIL SERSCHA SEREX EQTYP BSTVP" '
NR == 1 {
    n=split( str , arr , " " )
    for( i = 1; i <= n ; ++i )
        arr_ac[$i]=i
    for( i = 1; i <= n ; ++i )
        col[i]=arr_ac[arr[i]]
    print str 
}
NR > 1 {
    for(i = 1; i <= n ; ++i )
        printf("%s ",$col[i])
    printf("\n")
}
' file >> final_data.txt