Thanks Deepak, I'll check that. While I was testing yesterday the full load (i.e. without delta) it was picking up the manager for some and for some it wasn't - strange - but I did not check the HRLDAP_PERNR table. I could not make the connection as to why it was doing this and was wondering if it was something to do with the pa20 or po13 master data for those users.
But I will check the table and come back.
Thanks
Ranjit