BSSV Integer to Mathnumeric

We are having an issue . Through our e-commerce website we are evoking the standard Sales Order BSSV for creating orders for configured parts . One of the input parameters inside the configuration tag is the segment number .The mnParentSegmentNumber , expects a math numeric value, we are passing a Integer value from our ecommerce website, but a NULL is getting passed . There is code inside the standard BSSV to do the data transformation if integer is passed in , but NULL gets passed inside the datastructure. So it never gets a chance to convert to a mathnumeric. We