Update data in ODS object

Hi,

I use BW 3.1B, I want to load data in 2 ODS object.

I want to use infosource 2LIS_11_VAITM and 2LIS_13_VDITM.

I'll load data with delta update (after initialization).

In the update rules, for the Key figure must I set "addition" or "overwrite"?

I have found some notes about this topic for infosource 2LIS_11_VAITM but not for all Key figure and not for 2LIS_13_VDITM.

Thanks a lot.

Nadia Magistrelli