Delta via calculation view

Hello.

I have a question regarding using delta records.

Lets assume we have BW 7.5 running with SAP ERP (not on HANA). We are loading data from 0fi_gl_4 (GL line items, ODP) to BW system. We upload delta to the mirror level and than use a calculation view to enchance GL recoreds with some additional analytics we want.

So the question is how can we move only delta records through that CV?

Tnx in advance.