Compiler error on INPUT/DISPLAY ARRAY with 2-dimensional array

Hello,

I have a pice of code that uses 2-dimensional arrays with INPUT/DISPLAY 
ARRAY, here a minimal example:
>>> 
main
define la_x array[5,50] of record a char(3), b char(10) end record
define lv_idx integer
let lv_idx = 1
let la_x[lv_idx, 1].a = "a1"
let la_x[lv_idx, 1].b = "b1"
open window w at 1,1 with form "f1"
call set_count(10)
display array la_x[lv_idx] to s.*
close window w
end main
<<<

form:
>>> 
database formonly
screen
{
[a |b      ]
[a |b      ]
[a |b      ]
[a |b      ]
[a |b      ]
[a |b      ]
[a |b      ]
[a |b      ]
[a |b      ]
[a |b      ]
}

attributes
a = formonly.a;
b = formonly.b;

instructions
screen record s[10] (a,b);
<<<

this compiles and runs on 4JS BDL (can't test with "real" I4GL), but 
throws a compiler error on aubit:

[...]
open window w at 1,1 with form "f1"
call set_count(10)
display array la_x[lv_idx] to s.*
close window w
|___________^
| Error at line 10, character 13
| Variable cannot be used for an DISPLAY ARRAY (close)
end main
[...]



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