I’ve just updated the page on solubility and added a couple of useful assay references.

Solubility may also have an impact on preclinical assays, limited solubility in preclinical ADMET assays may give a false impression of the compounds profile in in vitro assays. Many of the false positives seen in Fragment-based screening are thought to be due to poor solubility at the high concentrations used in the screen. Perhaps the most important is the impact poor solubility can have on gastrointestinal absorption it may also preclude other routes of administration (intravenous).