Space in set analysis

[qvhjenvo]

Hi,

I have a set analysis like this

=sum({$<

  ledger_status_group_desc = {'Søknad'}

  ,monthyear= {">=$(=date($(vPreviousStartDate),'YYYYMM')) <=$(=date($(vPreviousEndDate),'YYYYMM'))"}

  ,year=

  ,month=

>} ledger_initial_amount_bc * currency_exchange_factor)

In this set, a dimesion monthyear

1 - monthyear= {">= $(=date($(vPreviousStartDate),'YYYYMM')) <= $(=date($(vPreviousEndDate),'YYYYMM'))"}

2 - monthyear= {">=$(=date($(vPreviousStartDate),'YYYYMM')) <=$(=date($(vPreviousEndDate),'YYYYMM'))"}

3 - monthyear= {">=$(=date($(vPreviousStartDate),'YYYYMM')) <= $(=date($(vPreviousEndDate),'YYYYMM'))"}

4 - monthyear= {">= $(=date($(vPreviousStartDate),'YYYYMM')) <=$(=date($(vPreviousEndDate),'YYYYMM'))"}

Because of adding/removing a space in monthyear-dimension, that gives a different result. 

Someone could please explan me what the four differences are in monthyear dimension. Thanks in advance

Loi