Shipping conditions of customer are not populating in service order

Hi every one,

I am facing a problen in shipping conditions determinations in to service order and complaint. As per standard SAP shipping conditions will populate automatically in to transactions based on the customer master data, but now it is not working. Guide me if any configuration settings i have to do.

                                                                      Thank you

                                                                                                                                                                                                           Regards

                                                                                                                                                                                                           Ravi