There is some support for viewing and editing drug orders within a flowsheet, as was authored against OpenMRS 1.9 and prior.
With the latest updates to build and depend upon OpenMRS 2.3 and higher, support for Drug Orders needs to be fixed / re-implemented.
The locus of this fix should be in the DrugOrderEditController, which added an UnsupportedOperationException and commented out the section beneath the throwing of this Exception, as relates to saving Drug Orders. The goal should be to re-enable the functionality that was lost here, which will likely require a larger scale modification to reflect the nature of Drug Orders in 1.10+ (eg. immutability, etc).
As at the time of this writing, the htmlformentry module also fails to process Drug Order tags without throwing an error in OpenMRS 2.3, this likely needs to depend upon that particular fix. See