Updating 1 field in Master Data

The situation is as follows, there is a Master Data infoobject A with 17 fields (InfoObjects), which get updated every day. Out of those 17 fields, 1 field is a marker that states whether the master data row is valid or invalid (for our reporting needs). I want to be able to have a data load with only 2 fields, the key field, and the marker field, to update just that marker field in the master data table. Is that possible, or since I have transfer rules already designed to update ALL 17 fields, I have to provide information to the other fields as well?

Thanks,