Factorio Forums

(This might be a feature request instead of a bug depending on the whether this is intentional or not)

When a Roboport is connected with a wire to read the logistic network content it correctly detects the Repair Pack sitting in its inventory.
But when a Construction Bot uses the Pack it temporarily disappears from the network.

I assume this is intentional for most items since Construction Bots usually place something but in this case it is rather annoying.
For example, I have an outpost with logic to request resupplies if resources (like Repair Packs) run out. Any time my walls are attacked the train is called to resupply Repair Packs only to not deliver anything because the Packs are back in the system by the time the train gets there.

Not a bug, items in robot transport are never counted by the network except for as satisfying the request they are bound for.

The very simple solution to your setup is to request the train when there are less than 100 repair packs, and enable the unloading inserters while there are less than 200 repair packs. That way there is a buffer of 100 packs at the wall that must be used before the next train is called.