The Performance Indicator shows how the Campaign Item performs with current delivery data (depending on the Billing Category).
running positions it calculates the performance for the future based on current Delivery Data
. The field then tells you how much of the initial goal (the Campaign Item Quantity) will be reached, if delivery data comes in at the same rate as until now. If the Item has already ended or is ending today, the Performance Indicator shows how much percentage of the quantity is met by the lifetime delivery data.
Please keep in mind, that this is just a projection of the Line Items performance and it does not take fluctuations of delivery data across the items runtime into account. Also the indicator for running positions always calculates with the current date, as in the future. This means, at the end of the day, when the delivery information are updated, the performance indicator might be slightly higher