Proposal-Index
This property can be set before 
Proposal in order to specify a particular position for the newly added proposal. Each proposal is identified by a number that matches its position in the list, starting from 1. The new proposal will be added right before the one specified by this property.
 
Example - Add one proposal text on a specific index
screen section. ...   03 screen-1-ef-3 Entry-Field      line 35.8      column 49.7      size 11.6 cells       lines 3.5 cells       id 20      3-d      proposals-unsorted      proposal-delay 400      . ... procedure division. ...   modify screen-1-ef-3 proposal-index 3 proposal "rox" ...  |