IDOC FIDCCP01 for Preliminary Posting

Hello SAP Gurus!

I'm using a Z transaction to fill iDoc FIDCCP01 segments with information that comes into a TXT file from our banks.

The problem is that, for a particular BLART field (Document type), the iDoc should not Post the document, but "just" create a Preliminary Posting. Is there anyway to setup the iDoc for this kind of action?

Thanks!