Message type: E = Error
Message class:  VK - Pflege und Bearbeitung von Konditionen 
Message number: 406
Message text: Condition types &1 and &2 have different condition calculation types
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The SAP error message VK406 indicates that there is a mismatch between the condition calculation types of two condition types in a pricing procedure. This typically occurs when you are trying to use two different condition types that are not compatible with each other in a pricing scenario.
Cause: The error arises when: You have two condition types (e.g., discounts, surcharges) that are set up with different calculation types (e.g., one might be set to "percentage" while the other is set to "fixed amount"). The pricing procedure is trying to apply both condition types together, but they cannot be processed in the same calculation due to their differing types.
Solution: To resolve the VK406 error, you can take the following steps: Check Condition Types: Go to the condition type configuration in SAP (Transaction code: V/06). Verify the calculation types of the condition types involved in the error. You can find this under the "Calculation Type" field. Adjust Pricing Procedure: If
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