dds for physical file

must fallow these levels

1. File-level entries
2. Record-level entries
3. Field-level entries
4. Key field-level entries

 reference


http://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=%2Fdbp%2Frbafoexdphy.htm

http://publib.boulder.ibm.com/infocenter/iseries/v7r1m0/index.jsp?topic=%2Frzakb%2Fdphydds.htm