Hi,
I do have some info on the RJART setting.
if the article is listed as concessionaries, MVKE-RJART = 'X'.
Next, you delisted the article from the sales area, MVKE-RJART = 'X".
When article is discontinue, MVKE-RJART = 'X"
When the article is turned back as ACTIVE as a NORMAL listing, MVKE-RJART = 'X".
when a new article is listed as NORMAL, MVKE-RJART = ' '.
There is a Z program provided by SAP to change this flag ON and OFF.
Search pattern = "Z*MVKE*"
With the MVKE-RJART = 'X', the posting of POS will also take a look at the setting in WLK1.
Hope this info will help.