Item Import - completes with " Completed Error" status and process_flag=4

Question

I am trying to Import Item through Open Interface.
RDBMS : 9.2.0.5.0
Oracle Applications : 11.5.10
Populated data into mtl_system_items_interface with process_flag = 1.
Once I run the "Item Import" program it completes with error, with the following in the log file.
The records are updated with process_flag = 4. but there are no error details in mtl_interface_errors for those corresponding records in the interface table.
How do I identify the error ?
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Inventory: Version : 11.5.0 - Development
Copyright (c) 1979, 1999, Oracle Corporation. All rights reserved.
INCOIN module: Import Items
Current system time is 07-SEP-2010 11:39:11
Page Length = 93, Page Width = 132
===================================================================
Debug Mode : Enabled
Output to Terminal : No
Argument Method : Database Fetch
Trace Mode : Disabled
===================================================================
Argument 1 (ORG_ID) = 174
Argument 2 (ALL_ORG) = 1
Argument 3 (VAL_ITEM_FLAG) = 1
Argument 4 (PRO_ITEM_FLAG) = 1
Argument 5 (DEL_REC_FLAG) = 1
Argument 6 (PROCESS_SET) = 11
Argument 7 (CREATE_UPDATE) = 1
===================================================================
Item Catalog Group Descriptive Elements Open Interface import completed successfully for all records in this record set.
Item Catalog Group Descriptive Elements Open Interface import completed successfully for all records in this record set.
Start of log messages from FND_FILE
End of log messages from FND_FILE
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Answer 1

Found a few Packages related to Item revision , were in Invalid status.
Compiled them all and now the items are getting imported without any issue.
Thanks Sandeep for your word.