SAIP Membership XSLT Transformer and enrollment

If one looks behind the scenes to determine how a student gets selected to get processed through the SAIP batch run, the student has to have rows of data in both the STDNT_ENRL and SAE_ENRL_EXT tables linking up by institution, strm, emplid, acad_career, and class_nbr.      If these match up, then the student would be selected and be written to the membership file and marked as 'Active' in the class.    Continuing on, if a particular student decides to drop the class, depending on if the date of the drop is before or after the LST_DROP_DT_DEL on the ACAD_CALSES_TBL, the student either