Logical data base

hi experts!!

i am working on the LDb report and i have created a LDB zaxxx in se36 and using the same LDB to code in se38 and in attributes i have mentioned the name of LDB.

when i code follwoing:

GET ZAXXXX FIELDS INVOICE_NUM CUST_NAME CUST_PO_NUM INV_DATE.

ITS GIVING ERROR THAT ZAXXX IS NOT SPECIFIED FOR FIELD SELECTION.

when i use only

GET ZAXXXX . when i debug valuse are comming but when process the report its giving no valuse.

plz suggest me on the same..

mahesh