Hi @IniNaadiJ
It looks like you have used a database method as the rest endpoint which is the cause of the error.
As I assume, you want to setup sending and receiving of E-Invoice within same IFS instance and between companies? For that you need two routing address/rule sets for sending and receiving.
Please refer the IFS documentation for some explanation.
IFS Connect for Sending IFS e-Invoices - Technical Documentation For IFS Cloud
IFS Connect for Receiving IFS e-Invoices - Technical Documentation For IFS Cloud
One way is to to setup a (s)ftp location and setup a IFS Connect sender and a reader to write the file and read the file from the same location.
Otherwise, you could setup a HTTP type routing address for sending the file to the IFS instances’ Soapgateway which will input the file as a new application message as well. This will eliminate the need of a (s)ftp setup
SOAP Gateway - Technical Documentation For IFS Cloud
Hope it helps!
Damith