I am getting quantityUnits not among allowed concepts error.

Openmrs Version :2.0.6 Build 453af9

Rest web service : 2.21

The allowed units are specified by a concept which in turn is specified via a global property. Look in your Advanced Settings / Global Properties for order.drugDispensingUnitsConceptUuid and similar settings.

Yea you are right. Was missing dosing units uuid in global properties