ASA does not require to drop constraint before dropping tables, and DROP statement syntax used by Hibernate to drop constraint is not compatible with ASA, so disable it. Comments matchs SybaseAnywhereDialect from Hibernate-3.1 src

public override bool DropConstraints { get; }

Public Overrides ReadOnly Property DropConstraints As Boolean
	Get

public:
virtual property bool DropConstraints {
	bool get () override;
}