Content Conversion XI 7.0

Hi

I have configured a sender file adapter to convert csv file to xml. The incomming records are comma separated and optional field will just come as ",". The file adapter is giving following message

2006-10-16 17:22:36 Success Channel CC_TW_TLOG_SENDER: Entire file content converted to XML format

2006-10-16 17:22:36 Warning Channel CC_TW_TLOG_SENDER: Empty document found. Proceed without sending message

If I process records without any blank values it is processing properly

Example : TWS001,01,,XXX,ABC -- Fails

TWS001,01,A,XXX,ABC -- Works

In the second case the value A is populated.

Content conversion configuration, I have made sure that KeyField value is not empty.

Any help on this.

Regards

Prahllad