Hello Jens,
I moved the thread to the SAP Business Bydesign community from the financial management community as this question relates to the Bydesign CRM area.
That being said,
I tried to recreate the scenario in one of the reference system and notice the same behaviour as you did.
When contract start date is in future, system created the invoice request with the status : "Processed".
This happened when
Contact start date : 01.10.2015
Contract end date : 30.09.2016
Contract date : 11.09.2015
So Invoice request had status processed based on the contract date.
When I change the contract date to future, i.e 01.10.2015, upon releasing the contract, system raised invoice request with the status to be invoiced.
I am no expert in customer invoice requests area. but here is what I understood, invoice request are being processed on the contract date (Item level and header level. I am not sure which one takes priority but I assume one maintained on the item level).
I hope this will help you please close this thread if this helps and answers your question.
Regards,
Harshal.