Master Data InfoObject why it invalid ?

I do have master data infoobject 0JOB . The extraction are Delta. A lots of record under this infoobject masterdata contained invalid masterdata.

Why this thing happen ?? Why its become invalid

Are this cause of :-

1) under R/3 they will delete this 0JOB which no longer been used? ( Delta not capable to delete this JOB once it deleted under r/3 )

Sorry I'm still tyring to understand .. anyone could help me to explain more detail..

Point for sure..

Thanks..

Edited by: Edi Erwan Abu Talib on Nov 23, 2008 4:04 AM