Apache Pig: LIMIT inside FOREACH referencing toplevel field, Scalar has more than one row in the output

Question

This question is similar to one asked two years ago, however for some reason, it does not work for me. Actually this is a combination of two ideas (answered questions) as given in the header. The example below replicates the accepted solution however it does not work for me: What is my mistake? I give a complete self contained working example:

Here is the data: cat in_detail.csv

grp,val
1,2.1,
1,4.2,
1,6.3
2,6.5
2,1.2
2,4.3
2,3.2

cat in_cnt.csv
grp,cnt
1,2
2,3

output expected (sort order not important):

grp,val
1,2.1,
1,4.2,
2,6.5
2,1.2
2,4.3

Here is the code: with the error message

detail1    = LOAD '/tmp/sD_mvmd/c0nelha/data/in_detail.csv'   using PigStorage(',') as (grp:chararray,num:double);

cnt1       = LOAD  '/tmp/sD_mvmd/c0nelha/data/in_cnt.csv' using     

PigStorage(',') as (grp:chararray,cnt:int);

d_group = GROUP detail1 by (grp);

describe d_group;

--d_group: {group: chararray,detail1: {(grp: chararray,num: double)}}

describe cnt1;

--cnt1: {grp: chararray,cnt: int}

detail2 = JOIN d_group by (group), cnt1 by (grp);

describe detail2;

--detail2: {d_group::group: chararray,d_group::detail1: {(grp: chararray,num: double)},cnt1::grp: chararray,cnt1::cnt: int}

detail3 = FOREACH detail2 {

    mySelection   = LIMIT d_group::detail1 detail2.cnt1::cnt;

    GENERATE mySelection;
}

-- Apache Pig version 0.12.1.2.1.5.0-695 (rexported) compiled Aug 27 2014, 23:56:19

-- Backend error : Scalar has more than one row in the output.

-- 1st : (1,{(1,6.3),(1,4.2),(1,2.1)},1,2), 2nd :(2,{(2,3.2),(2,4.3),(2,1.2),(2,6.5)},2,3)

dump detail3;