parse_error in COND inside LET

This code raises a parse_error, caused by COND inside the LET statement:

rv_info = CONV string(
        LET height_dec  = COND #( WHEN lv_height_unit = 'M'  THEN 2 ELSE 0 )
            weight_dec  = COND #( WHEN lv_weight_unit = 'KG' THEN 1 ELSE 0 )
            height_unit = to_lower( lv_height_unit )
            weight_unit = to_lower( lv_weight_unit )
            height = COND #( WHEN lv_height <> 0
                         THEN |{ 'Height'(001) }: { lv_height NUMBER = USER DECIMALS = height_dec } { height_unit }| )
            weight = COND #( WHEN lv_weight <> 0
                         THEN |{ 'Weight'(002) }: { lv_weight NUMBER = USER DECIMALS = weight_dec } { weight_unit }| )
            IN COND #( WHEN height IS NOT INITIAL AND weight IS NOT INITIAL
                           THEN |{ height } \| { weight }|
                       WHEN height IS NOT INITIAL
                           THEN |{ height }|
                       WHEN weight IS NOT INITIAL
                           THEN |{ weight }| ) ).

Statement does not exist in ABAPv754(or a parser error), “rv_info”(parser_error)

[larshp]

regarding types, note that ABAP has a lot of implicit conversions, following runs without problems

  DATA(lv_height) = 2.
  DATA(sdf1) = |{ lv_height NUMBER = USER DECIMALS = '2' }|.
  DATA(sdf2) = |{ lv_height NUMBER = USER DECIMALS = `2` }|.
  DATA(sdf3) = |{ lv_height NUMBER = USER DECIMALS = '2' + 1 }|.

only something like

DATA(sdf4) = |{ lv_height NUMBER = USER DECIMALS = 'A' }|.

dumps, but it dumps at runtime, no syntax errors or warnings

[jrodriguez-rc]

Right, I was using an old version from npmjs. Changed not works ok. Thanks!