Usefull Links

Getting the difference between Dates
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http://asktom.oracle.com/pls/asktom/ASKTOM.download_file?p_file=6551242712657900129

Interfaces and Conversions in Oracle Applications
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http://www.erpschools.com/apps/oracle-applications/Articles/General/Interfaces-and-Conversions-in-Oracle-Applications/index.aspx

Bom Interface:
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http://www.erpstuff.com/forums/topic.asp?TOPIC_ID=1083

All PO Queries:
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http://oracleerp4u.blogspot.com/2010_09_01_archive.html
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http://oracleerp4u.blogspot.com/

Below Link is used for Training in all modules with screenshot & Apps Technical also.
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http://confluentminds.com/Trainings/