No authorization for number range object type BTI and activity SHOW

Hi All,

When I try to execute

SAP Easy Access screen - > Auto-ID Infrastructure -> Master data -> Number Ranges -> Number Range Administration

on the next web window when I select the object type BTI , it comes up with the error

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Number range table not maintained for object BTI in customizing

No authorization for number range object type BTI and activity SHOW

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I am using AIN 5.1 . Is this an authorization issue ?. If so which all roles I should give to the user? IF you have any idea about this please share some tips.