Activity of type "Refund” without AP segment on behalf of refunds AR to AP

We are trying to implement the automation of refunds for customers from AR to AP.

Therefore we need to create a Receivables Activity of the type "Refund".

In this activity we have to define an Activity GL Account. In order for the refund to work properly we apparently have to include the AP segment in this account.

If we use an other segment we get the error “Invalid Liability Account” at a later stage in the process.

However in our "Security Rule Elements" we have excluded the use of this specific segment (as we use this segment as part of the standard, system defined, automatic generated journal line in the complete AP Journal).