Vendor Capacity Planning

Hello Sir,

In Source Allocation, under Vendor Capacity Planning, I am trying to "Maintain Capacity Periods".

While entering the data at Material Level (the lowest level) in the Capacity subscreen.

I am getting the error message as

"Number ranges module termination:"

Could you please  give me a clue of the possible problems or settings to be done.

Thanks in Advance, Ajay