English to German Bus/Financial Business/Commerce (general)

Open territory coverage
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Accounts should be transitioned when the territory becomes open.
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If a territory becomes open within 3 months of renewal, the transition will be processed within the same month that the territory becomes open.

This is from an internal document describing sales processes, and it talks about "open territories" and sometimes "open accounts". The TM I received sometimes translates it as "betreut" and sometimes as "unbetreut", and I'm not sure either really fits...