What is the difference between a UI Policy and Data Policy?

[Lei Wang3]

What is the difference between a UI Policy and Data Policy?

• Data Policies run when data is entered through the form, by an Import Set, or by web services, while UI Policies are set only by web services
• Data Policies can be converted into UI Policies, but UI Policies cannot be converted into Data Policies
• Data Policies run regardless of how data is entered into ServiceNow, while UI Policies are used for form interactions
• Data Policies run only after UI Policies run successfully

which is correct? I saw different answers on the web. A or C? I am confused, which one is correct. 

[Mahesh23]

Hi, If I am not wrong B is correct

[Hitoshi Ozawa · Accepted solution]

Hi Lei,

A is wrong because UI policies also is effective on forms.

B is wrong because Data Policy can be converted to UI Policy and UI Policy can also be converted to Data Policy.

https://developer.servicenow.com/dev.do#!/learn/courses/sandiego/app_store_learnv2_scripting_sandieg...

D is wrong because data passed from REST API won't be run UI Policy but Data Policy would still apply.

This leaves choice C.

[Lei Wang3]

thanks for the clear explanations!

[Afrith Shariff]

All points are correct except UI policy can be converted to datapolicy and vice versa (if there is no scripting involved).