When you get a message in the BEx front end and want to find the id, go to table T100, enter your language in the SPRSL field and the text or part of the text in the TEXT field.
Some BEx Messages not listed in RSRT / Messages
BRAIN 641 – Variable &1 could not be replaced
BRAIN 109 – No data was found that meets the used conditions
Concerning BRAIN 641. This message cannot be suppressed in RSRT. See 1730446 – Variable *SAP-EXIT Variable* could not be replaced – BRAIN 641 for possible cause.Google+