Property Tab Builder does not accept names in use

I was trying to make a common Property Tab for all my Parts (quite logical). I added one Textbox and selected `Description' as Name and clicked `Show on Custom Tab'. I assumed that this will change the `Description' field in Custom Tap of Properties (see Property Tab1.jpg).

Now I added another Textbox and clicked `Show on Configuration Specific Tab' and selected `Description' as Name, it gave an error that `The name `Description' is already in use.'  (see Property Tab2.jpg).

If solidworks is accepting different `Description' s for Custom Tab and Configuration Specific Tab through File>Properties..; then why not through Property Tab (quite illogical)?

Any suggestions, please.

SolidworksUser Interface