Text to go in the release notes:
This enhancement makes sure that checks for the "AllowHoldsOnPatronsPossessions" policy is now made for all interfaces (Staff interface, OPAC, WebServices). Before this change it was not checked for WebServices (ILS-DI).
"AllowHoldPolicyOverride" can be used to override this setting for the Staff interface.
Note: This enhancement introduces a behaviour change, so if you use either of these system preferences review the settings to make sure they work as expected.