请教消息控制的问题

xiaoerp

消息控制的文章,其中关于MSW1,MSW2的作用是什么?
是将该工作区的警告消息改为仅显示吗?那分为1和2又有何区别?

REPORT  MASSMSGBACK                   .
TABLES MASSMSGCFG.
PARAMETERS: ARBGB LIKE MASSMSGCFG-ARBGB OBLIGATORY.
DELETE FROM MASSMSGCFG WHERE UNAME = SY-UNAME AND ARBGB = ARBGB.
MESSAGE S121(M&).
Detailed pls see :
This function contains some warnings that you can hide on a user basis by selecting the indicator Do not display warning in future. All of these warnings will now be displayed to you again, irrespective of whether you ever hid them.