Begin a new error reporting environment by marking a new error reporting context and then resetting the status argument to SAI__OK. If ERR_BEGIN is called with STATUS set to an error value, a check is made to determine if there are any messages pending output in the current context: if there are none, an error report to this effect is made on behalf of the calling application.

CALL ERR_BEGIN( STATUS )

STATUS = INTEGER (Given and Returned)