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There are many factors that go into determining whether or not an order is valid, including many different context-specific details (what's being ordered, type of order, care setting, orderer) and often incorporating implementation-specific business rules.

Basic Validation

Required for All

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Orders

• Patient
• Encounter
• Care Setting
• Concept (what is being ordered)
• Instructions
• OrdererOrderer
• Urgency
• Start date

Assumed defaults

• Order ID – assigned by the API
• Care Setting – set to the default Care Setting within the user context
• Order type – inferred from the concept being ordered, i.e., getOrderTypeByConceptClass(order.concept.conceptClass)
• Urgency – API assumes ROUTINE
• Action –API assumes NEW
• Start date – API assumes date created
• Creator – API assumes current user
• Date created – API assumes now

Drug orders

• Drug (formulation)
• Dosing type
• asNeeded
• Instructions corresponding to dosing type
  • Simple: dose, dose units, route, frequency, and as_needed (defaults to false). Any unstructured instructions go into drug_order.dosing_instructions
  • Free text: ordersdrug_order.dosing_instructions

  • Other dosing types (i.e., not simple or free text): drug_order.dosing_instructions

• For outpatient care settingsettings: quantity, quantity units, and number of refills (not required for inpatient drug orders)

Other Validation Rules

• Concept (and Drug for drug orders) cannot differ on revised orders (when previousOrder != null, order.concept must match order.previousOrder.concept)
• For discontinuation orders with a previous order, concept and its previous order's concept must be the same
• The dateStopped of a previous order should be the same as the start date of the revised or discontinued order
• Cannot order retired orderables e.g retired drugs or concepts? In case of retrospective data entry dateStarted should come before dateRetired
• Unit concepts(quantity, duration and dose units) should be of units concept class(es)
• Frequency concepts should be of frequency concept class

• order.startDate can't be before its encounter's encounterDatetime

• the order Stopped orders cannot be revised – i.e., if an order is being revised or , the previous can't order cannot be  a DC order

• Patient can't be on the same order at the same time, for drug orders, exception is the patient can be on different formulations but same concept.

• Class type for DC and drug order should match, same for revisionJava Class and order type for a dicontinuation or revision should match that of its previous order should match

• scheduled_date can only be specified with the correct urgency, currently the only supported urgency is ON_SCHEDULED_DATE but there could be others added

• order.startDate can't be in the future

• order.concept.conceptClass should be in order.orderType.javaClassAsClass conceptClasses respecting order type hierarchy i.e the check should happen recursively for all ancestors if not found on the immediate order type.
• order.orderType.javaClassName should match order.class, subclasses are allowed

Not sure how all this will work with retrospective data entry of orders

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• .name, taking into consideration class hierarchy.
• For any field that has a corresponding units field, if it is specified then automatically the matching units field becomes required, i.e. if quantity is provided,  quantityUnits becomes required, if duration is provided, durationUnits becomes required etc.

We might want to implement these in the future:

• Cannot order retired orderables e.g retired drugs or concepts? In case of retrospective data entry dateStarted should come before dateRetired

• Patient can't be on the same order at the same time, for drug orders, exception is the patient can be on different formulations but same concept.

Extensible Validation

Ultimately, implementations will need to be able to introduce their own business rules for order validation.  Some examples of common business rules:

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In order to accommodate implementation-specific business rules that may vary based on context, OpenMRS should implement some basic "out-of-the-box" business rules in a manner that can be adapted by implementations.  A validator chain would invoke 1-to-N order validators, passing the current order along with the ordering context (Encounter, CareSetting, Orderer, User) and collect a list of validation errors that could be passed back to the user.Other Validation Rules