SAP Message R7039 - Characteristic &1: Navigation attribute &2 was deleted --> conversion

Diagnosis Navigation attribute &V2& from charactreistic &V1& has been deleted. System Response The values that were saved in this field in theAttributes SID Tables, were deleted duringactivation. Activation may take longer, because the attributes SID Tables have tobe converted during activation. Procedure If activation lasts a very long time or cancels because of a timeout,you will have to carry out the activation in the background. To do thisselect 'Characteristic' --> Activate in Background'.