At present, the classification of projects in AfT databases is constrained by the fact that donors can ‘tick’ only one box (i.e. assign only one CRS code) to individual aid flows. This exclusivity is hard-wired into the CRS system by design, in order to avoid any donor potentially double-counting contributions across different AfT categories. As noted earlier, this avoidance of double-counting has a strong political rationale, given that some donors have made written pledges to reach quantitative targets for their AfT contributions.