Dear Peter,

First of all the question is, do you have a CRM module available?
This is required to have activities at all...

Regarding automatically creating activity in case particular item is ordered or invoiced - there is no such functionality in the standard package, but it could be quite easy additionally developed, using HAL customizations.

Best regards,
Eberstein Business Solutions
HansaWorld Business Partner
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Exceeding Customer Expectations
www.ebersteins.com