There is no (line) account information for SPA502G

When adding a SPA502G phone there is no option to select what line1 is.

That might be logical since its a single line phone but it leads to some problems. First of all at the extension mapping there is no indication for "Account 1" 

 

And 2nd and most important the provision file is generated wrong. According to basefile edit the line's short name  should be 

{noformat}
<Short_Name_1_ ua="na">_line1label</Short_Name_1>{noformat}

but it is generated this

{noformat}
<Short_Name_1_ ua="na"></Short_Name_1_>{noformat}

so on the phone there is nothing displayed at the line key.

Using endpoint 14.0.26