Tracker can be (and are starting to be) used for creating forms of offers and demands in communities... (knowledge banks, time banks, openmoney....)
In our case, from tracker demands there is a field linking (through "item link" field) to tracker offers (a demand in the demands tracker can be for a specific offer already inserted in the the offers tracker).
In this case, it's needed that (optionally) a inter-user message is sent to tracker item creator when that item is automatically linked from another tracker item (from another tracker, in our case).
Other way, it's hard for a user to know if another user has requested some of this offers...
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