Hello,
I am getting this error message you can see in the screenshot. I am not trying to post anything against the main account on the error. As you can also see the main account that is intended to be used is different. On the debit side of the journals I have a vendor.
As you can see the main account on the error doesn't even exist:
Both accounts I'm using on the journal, the expense account and the summary account for the vendor group are part of an active account structure and abide to the rules of it.