Before him going out on vacation, I negotiated with my manager on the specs of my new laptop (as well as the budget) and we settled on a model and specs.
Today, out of curiosity, I asked our head purchasing (who also manages budgets) to ask our hardware provider whether future hard drive swaps void warranty. The logic behind that question is me thinking what happens if a large SSD turns out to be a necessity in the future. Her response was, we should just change the order to the same laptop with a large SSD as she doesn't want to have to deal with incremental upgrades.
If I say yes to the head of purchasing, is this me considered me going behind my managers back while he is on a vacation?
side note: it is not about costs (as it doesn't cost that much), it is more about the principle of the situation as I could have asked my manager for the SSD at first instead of some other maxed out specs (less RAM probably).