Document Number for Quotation!!!

Hi Experts - I need to display Document Number for Quotation instead of Quotation Id. By default the code for Quotation ID m_tPSAQuotationsTmp.QuotationId = salesQuotationTable.QuotationId; I wrote the following code in the AOT\classes\PSAQuotationsDP\insertPSAQuotationTmp for displaying Document number for Quotation but this code is not works for me. Please help me in this...

m_tPSAQuotationsTmp.QuotationId             = CustQuotationJour::findFromSalesQuotationQuotation(salesQuotationTable.QuotationId).QuotationDocNum;

Thanks,

Faqru Shaik