fix

db/StoredProcedures.sql

@@ -1060,7 +1060,7 @@ BEGIN
 	INNER JOIN `specializations` 	ON 	study_groups.SpecializationID = specializations.ID AND
 										FacultyID = specializations.FacultyID
 	WHERE 	study_groups.GradeID = GradeID 	AND 
-			study_groups.GroupNum = GroupN
+			study_groups.ID = GroupN
 	LIMIT 1;
 	IF StudyGroupID <= 0 THEN
 		RETURN -1;