API Price request doesnt apply qualifier for customer

Hi

I am working with the API QP_PREQ_PUB.PRICE_REQUEST, I need to get the price for an item, the price has distinct qualifiers and one is for the customer, the api is retrieving to me the list price without applying the qualifier for the customer, here is my code, do you have any suggestion about why is happening this. Thanks in advance.

--Definiendo los distintos parámetros que controlan la conducta
    v_control_rec.pricing_event           := 'LINE';
    v_control_rec.calculate_flag          := 'Y'; --QP_PREQ_GRP.G_SEARCH_N_CALCULATE;
    v_control_rec.simulation_flag         := 'N';
    v_control_rec.rounding_flag           := 'Q';