"I am wondering why "unchecking" the top rail would caused the railing element to be delete."
the screen shot you posted are your baluster settings, what is your railing structure set to? if the top horizontal piece is a "Top Rail", and no other railings are present, when you unchek the Use Top Rail option you will get that error.
https://autode.sk/3dYbi2e
if the intent it to have the balusters/pickets and NO top host... use what @barthbradley showed.
https://autode.sk/2Zlb417
Howard Munsell
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