Account Assignment with non-valuated stock

Question:
Hi everyone,
I have an interesting case and probably a infeasible one as much as I understood but i want to check with you with the hope of a solution!!!
We will run a SAP system as a stand alone Warehouse management system and we will also manage external procurement for some materials with Kanban. For that purpose, we will create Schedule Agreements. What we want to do is to prevent any kind of financial transactions to happen in the system. From a material perspective, we can do it with UNBW type materials. But whenever I try to create a schedule agreement, first it does not allow me to use account assignment type U and second I couldn't figure out a way to bypass account assignment with the other account assignment categories(or do not have anything going to a G/L account or a cost center). Any ideas/comments/insight will be highly appreciated.
Thanks,
MKC
Answer:
You'll have to set up a minimal FI system (with dummy accounts if necessary) even when no postings will take place.
SAP always wants to find the accounts first before determining the amounts to be posted.
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