Hello Patricia,
The automatic account determination depends on many factors starting with the configuration in your system and possibly modifications/enhancements !
A cool thing to look at, is the account determination simulation :
This an example from my system where you can see that all accounts are ignored apart from consumption transaction. There is a short introduction here MM-FI integration: Account determination simulator.
Please provide one from your system for the movement type / qty-value update rule.
Additionally, if it is possible to provide a screen copy from OMWN and
last thing, is your system using the special ledger (FI-SL), if this is the case you get parallel accounting documents but those are not FI documents in the classic sense.
Alexandre
Message was edited by: Alexandre N. Re-organised the post and ideas.