Dear Oliver,
As per the screen shot the counter is not assigned to object. If its assigned then the ibase details will appear in Assigned object field and you need to maintain Minimum value and Maximum value to the counter.
Check once in the contract item level for reference object, in that area object is assigned or not.
you can assign the counter there.
And also check the contract is created for the object or not. And also need to check the price agreements in the contracts.
I think this information will help you
Regards
Praveen