Markus: For example, if you were only commissioned for phase 5 and this has a very large order amount, you would like to plan and book partial services.
Projo's suggestion is to implement this through two functions:
1) You should be able to convert a phase with, for example, 10 partial services into a sub-project with 10 services. As a result, every partial service (now performance) can be planned, planned and controlled.
2) It must be possible to mark a sub-project that the underlying services are not listed in the invoice.
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