I'm not an enrolement expert. In general the enroleid is the id of the enrolement method that is enabled for the specified course. You find it in enrole in the DB.
 | id | enrol | status | courseid | sortorder | name | enrolperiod | enrolstartdate | enrolenddate | expirynotify | expirythreshold | notifyall | password | cost | currency | roleid | customint1 | customint2 | customint3 | customint4 | customchar1 | customchar2 | customdec1 | customdec2 | customtext1 | customtext2 | timecreated | timemodified | ||
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1 | manual | 0 | 2 | 0 | NULL | 0 | 0 | 0 | 0 | 0 | 0 | NULL | NULL | NULL | 5 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | 1326902657 | 1326902657 | |
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2 | guest | 1 | 2 | 1 | NULL | 0 | 0 | 0 | 0 | 0 | 0 | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | 1326902657 | 1326902657 | ||
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4 | manual | 0 | 3 | 0 | NULL | 0 | ||||||||||||||||||||||