abap/hr isuue

Hi Expert !

plz explain me following code .

when i m executing this program i m getting following error .

1 ."pernr is not defined for currentlogical database "

2 statement RP_PROVIDE_FROM_LAST is not defined .

3. field PN-BEGDA is unknown .

TABLES: PERNR.

INFOTYPES: 2001 MODE N.

GET PERNR.

RP_READ_ALL_TIME_ITY PN-BEGDA PN-ENDDA.

LOOP AT P2001.

WRITE: / P2001-ABWTG.

ENDLOOP.