On 29 October 2012 10:49, Simon Vass <address@hidden>
I now can create an invoice thanks for the pointer to the payment terms field.
Is the idea that to create an invoice you manually add all the correct services/procedures/tests then click create Invoice
Yes, that is the idea, see earlier discussion with Luis 
or should the services be populated as the procedures are being carried out?
The process I would like to model is that a doctor for example requests a lab test, before the lab test can be done it has to be paid for by the client,
+ 1, 
then the test can proceed. Is there a way to model this right now? or do I need to play with triggers/workflows?
Also how would I use pip install to install say the 2.4.2 analytic accounts module from Tryton?
You can use the command: pip install --user <package name>==<version number> , so for the analytic account, it will be: pip install --user trytond_analytic_account==2.4.2