Kalyan,
I added the BEGDA and ENDDA in the E1PITYP segment and it worked fine. Now the idoc has this structure:
E1PLOGI
PLVAR = 01
OTYPE = P
OBJID = 37000015
OPERA = U
E1PITYP
PLVAR = 01
OTYPE = P
OBJID = 37000015
INFTY = 0007
BEGDA = 20130801
ENDDA = 99991231
E1P0007
PERNR = 37000015
ENDDA = 99991231
BEGDA = 20130801
SCHKZ = F551120
Thanks a lot!