BlackLine (BL), a provider of financial accounting software that is especially geared toward the period-end close process, is an attractive buying opportunity that has ceded a significant portion of its year-to-date share price gains in the recent rout of software stocks. So far this earnings season, many of the software sector's most richly-valued stocks have seen big reality checks - like Alteryx (AYX), Atlassian (TEAM), and several others. But alongside these corrections, BlackLine has also been swept up in the general correction despite no negative news on its front.