The figure shows a screenshot of the Expression box in the Expression Builder dialog. The Expression box contains the following line:

number(bpws:getVariableData('selectManufacturerResponse','parameters',
'/ns15:processRequestQuoteResponseElement/ns15:return/ns15:supplierPrice')) <
number(bpws:getVariableData('rapidManufacturerResponse','parameters',
'/ns16:POItemsQuoteResponse/ns16:return/ns16:supplierPrice'))