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The new Winter 26 release of Salesforce is in my sandbox. I wrote code that will recalculate tax and apply the difference to each OrderItemSummary line, using "Flow Core Action for Order Management: Adjust Order Item Summaries Submit" as my core action. Winter 26/version 65 allows us to create a tax adjustment only, with the line "AmountTaxOnly."

My flow runs two paths: this path is Run Immediately, then I have another path that runs to commit the transaction to Avalara using Run Asynchronously.

This worked exactly one time this morning, and the result of my class was this:

{
  "changeBalances": {
    "grandTotalAmount": 38.5,
    "totalAdjDeliveryAmtWithTax": 0,
    "totalAdjDistAmountWithTax": 0,
    "totalAdjProductAmtWithTax": 38.5,
    "totalAdjustedDeliveryAmount": 0,
    "totalAdjustedDeliveryTaxAmount": 0,
    "totalAdjustedProductAmount": 0,
    "totalAdjustedProductTaxAmount": 38.5,
    "totalAdjustmentDistributedAmount": 0,
    "totalAdjustmentDistributedTaxAmount": 0,
    "totalAmount": 0,
    "totalExcessFundsAmount": 0,
    "totalFeeAmount": 0,
    "totalFeeTaxAmount": 0,
    "totalRefundableAmount": 0,
    "totalRequiredFundsAmount": 0,
    "totalTaxAmount": 38.5
  },
  "errors": [],
  "inFulfillmentChangeOrderId": null,
  "orderSummaryId": "1OsVB000001wDcD0AU",
  "postFulfillmentChangeOrderId": null,
  "preFulfillmentChangeOrderId": "801VB00000ZwoOWYAZ",
  "success": true
}

This is a record-triggered flow upon OrderSummary creation. Whenever I run it after this first time, I get an error message. Even though the flow I'm calling this from is version 65, and the custom apex class that I use to calculate the ConnectApi.AdjustOrderItemSummaryInputRepresentation input is using version 65, this message appears:

Error element Adjust_Order_Item_Summaries (FlowActionCall). Method invoked in version 48.0. Minimum required version for 'adjustItems' usage is: 49.0

It will happen if I'm in debug mode as well. How do I correct this? Why would the version not match the flow?

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    Apex classes have a specific API version they run against. Check to see what this is for the Apex you are calling. If you can, update that version. If the Apex is in a managed package and you can't update it, you may need to write your own invocable method with a recent API version that calls through to the managed package code. Commented Sep 22 at 15:16
  • Thanks, that worked. The Core Action was using Salesforce API version 48 with the AVAMAPPER connector. After creating an invocable apex class that used the underlying method ConnectApi.OrderSummary.adjustSubmit(OrderSummaryId, ConnectApi.AdjustOrderItemSummaryInputRepresentation) to circumvent the Core Action, it runs without issue. Commented Sep 23 at 17:48

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Per comment suggestion, I was able to call the underlying method used in the Core Action to circumvent the API version that the managed package was using. I set my apex class to version 65 and then used "ConnectApi.OrderSummary.adjustSubmit(OrderSummaryId, ConnectApi.AdjustOrderItemSummaryInputRepresentation)" to submit the adjustment from the prior apex class. Works fine now.

Abstracted:

public class OrderSummarySubmitAdjustment {
    @InvocableMethod(label='Submit Order Adjustment' description='Submits order adjustment.')
    public static void submitOrderAdjustment(List<FlowInput> inputs) {
                
        for (FlowInput input : inputs)
        {
            ConnectApi.AdjustOrderSummaryOutputRepresentation adjustOutput = ConnectApi.OrderSummary.adjustSubmit(input.orderSummaryId, input.adjustInput);
        }
    }
    
    public class FlowInput {
        @InvocableVariable(label='Order Summary ID')
        public Id orderSummaryId;
        
        @InvocableVariable(label='Adjustment Input')
        public ConnectApi.AdjustOrderItemSummaryInputRepresentation adjustInput;
    }
}
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