Microsoft Navision Dynamics NAV 2009 Report programming

We are looking for a Microsoft Dynamics NAV developer for small projects coming up every once in a while. We are running Dynamics NAV 2009 and would like to get following issue done for now: 1.) Item tracking information (serial number/batch number) should be listed on the invoice/shipment report: Report ID 206 Sales - Invoice Report ID 208 Sales – Shipment 2.) We would like to get a report that Table 27 (item) / Field „Unit Price“ should be filed with a price that can be selected when running the report from a „Customer Price Group“ listed in the table 7002 (Sales Price). In case the selected Customer Price Group does not exist or price is empty, the item will be blocked. Example: Item 1000 has Unit price 0 (Tabel 27). Detailed sales price for „Customer Price Group“ „Testgroup“ (Table 7002) is 55. So the unit price will be set to 55 in Table 27. Item 1000 has Unit price 0 (Tabel 27). Detailed sales price for „Customer Price Group“ „Testgroup“ (Table 7002) is not listed/empty. So the item will be blocked.