How are my credits affected If I track with a Bill of Lading(B/L) Number?

Some users are worried about their credits when they track with a bill of lading number because, most of the time, B/L contains more than one container. 
Here is the rule: 1 tracking is equal to 1 credit. 
Please do not worry because regardless of how many containers your B/L has, when you track with a B/L number, only 1 credit will be consumed.