A data entry option, eg Sire, is not in drop down list in Live Entry

When trying to record data in Live Entry, some data options are not in the drop down list but others are. 

For example - choosing sire and not all sires are there

Example:

A Sire you wish to choose is not in the drop down list.

In Live Entry, Go to Setup > Session defaults and select the Restricted Lists tab

Ensure that any sires you wish to use, are not in that list. If they, are select the sire and hit remove.

This will bring the sire back as an option to use for data entry in Live Entry.