Symptom:
Need changes in BAT.xlt

Conditions:
Download BAT.xlt 

go to phones-users. 

Give name [AI-column]- minimum 12 characters. Enable dummy MAC address. Export to BAT format.

Upload it. insert it  under phones/users. Run it. In job status it will show error.

Thing is We have to create a name with SEP+12digits of MAC or BAT+12digits of MAC or 12digits MAC address. 
No use of  dummy mac address field in BAT.xlt 

Need following changes in BAT.xlt

Need change in phone/user name field. Instead of name[AI-column] , change it to "MAC Address/Device Name (String[12/15] MANDATORY)". 

go to phone .Need change in name. change it to "MAC Address/Device Name (String[12/15] MANDATORY)".

Remove dummy MAC address field.