To be efficient companies have to consider the trade off between high service levels and low capital tie up. This is particularly important in stores adjacent to assembly processes. Problems occurring in these stores impact customer satisfaction directly and the parts are stored on a high value added level further increasing the clash of targets. A method for positioning stores in compliance with both targets is proposed. Advancing the Logistic Stock Analysis this new method is especially tailored to consider unit service levels and thus to minimize capital tie up with regard to customer service levels for the first time.