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Experimenting with some pseudo-code, please improve as needed. @pospi @ivanminutillo @bhaugen

EconomicEvent which creates an EconomicResource:

If action.resourceEffect is "+" or "-"
    If create-resource flag is set
        Create the resource with zero quantity fields
    Else
        If it exists
            Get the resource based on resourceInventoriedAs
    If there is a resource from the above
        If action.resourceEffect is "+"
            Add event resourceQuantity to both accountingQuantity and onhandQuantity
        Else if action.resourceEffect is "-"
            Subtract event resourceQuantity from both accountingQuantity and onhandQuantity
Else if action.resourceEffect is "-+" or action.onhandEffect is "-+" (two resources can be affected)
    If create-resource flag is set
        Create the to-resource with zero quantity fields
    Else
        Get the to-resource based on toResourceInventoriedAs  
    If it exists in the event
        Get the from-resource based on the resourceInventoriedAs  
    If action is "transfer-custody" or "transfer" or "move"
        If the from-resource exists
            Subtract event resourceQuantity from from-resource.onhandQuantity
        If the to-resource exists
            Add event resourceQuantity to to-resource.onhandQuantity
    If action is "transfer-all-rights" or "transfer" or "move"
        If the from-resource exists
            Subtract event resourceQuantity from from-resource.accountingQuantity
        If the to-resource exists
            Add event resourceQuantity to to-resource.accountingQuantity
If a new resource is created by the economic event 
 or if ((action is "transfer-all-rights" or "transfer") 
 and resourceInventoriedAs is the same as toResourceInventoriedAs)
    Set the  primaryAccountable to the receiver agent