FI posting to cost sharing grants
We are having grants with cost sharing rules (e.g. External fund 80%, Internal fund 20%). In our derivation, GM objects are derived from internal order. And we have maintained the rule-based account assignment distribution. When we create PO and assign the internal order in the account assignment. System is able derive both external and internal fund. Thus both external and internal funds can be consumed according to the cost sharing percentage.
But if the document posted directly in FI, system can only consuming one fund derived in the derivation rule. How can we make the system to consume both external and internal fund for direct FI posting? Or anyone can share how you manage cost sharing scenario for direct FI postings?