Refund needs rules for link with webwinkelfacturen

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I have shopify connected with Silvasoft for my inventory management via Webwinkelfacturen. No I've a error with all my refunds.  To make sure my stock is up to date, the refunds must be continued. Now they say the problem lays by the fact there are no rules in shopify. I don't know what they mean.

Can anyone help me with this? Thanks Esther