This property describes the relationship between a preparatory activity and the activity it is intended for.
This may involve activities in preparation for other activities, or orders and other organisational activities, which lead to some other specific activity.
P20 had specific purpose (was purpose of) does not imply that an activity succeeded in achieving its aims. For example, dubious accounting practices may be carried out with the specific purpose of enhancing share values and enabling a take-over bid. The specific purpose remains the same even if the strategy fails and the company goes bankrupt instead.
Van Eyck’s pigment grinding (E7) had specific purpose the painting of the Ghent alter piece (E12)