EDOC_COCKPIT invoice document submitted, status stays "In process"

[KUP]

When we try to submit an invoice in the EDOC_COCKPIT the status is yellow. If I hover over the yellow triangle it says "in process" and the status description says "Req. sent to EWC". We are currently testing a change that involves the determination of a product code in the XML, so it is on our Q-system. Is there a system setting that may prevent edocs from being sent from Q like e-mails from SOST? I am totally new to the EDOC subject, so still many things I don't know. I also tried EDOC_BACKGROUND, but no change in status. Our system is still ECC not S/4 HANA yet.
Attached see some screenshots

Also I am new to SCN posting questions. So, sorry, if tags are too vague/wrong.