CREDİT TO PROBLEM

[SERKAN]

HELLO EVERYONE,I can’t create a purchase invoice.
Finally, this error occurs.
I think it’s a problem related to accounting.
I would be very happy if you could help.
Account is Creditors,but there is still problem

[manal_erpnext]

check this for selected account in yours

[SERKAN]

I 'have been dealing with those problems for 3-4 days.
I watched the training videos. But I still haven’t found a result.
I am using the demo version. Could this be the reason?
I will buy it soon.
Thanks