'D365 DIXF - How to overwrite document attachment

While using DIXF to bulk import product images, I'm stucked at the part where an attachment (productimage in this case) has to be overwritten. Process terminates telling me "operation not allowed". When I first manually delete the existing product image and then restart import, process is running without errors.

I already tried unchecked the call validate field in modify target mapping of entity.



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