Use two-option type of field in Business Process Flow to force user choose specified value to advance to next stage

 Requirement:

Force users to choose the specified value of a field in certain stage of Business Process Flow to be able to advance to next stage.

Solution:

1. Set the filed type to "Two Options", and don't set the value which you hope users to choose as the default value.

2. Click the “required” box of the filed on the process flow step, rather than set the requirement on the field definition in customization.