Is there a way to configure the document type in the target company? If not, would you still advise to move the assets to the target company?
I normally prefer doing the remapping in the code. If it is as simple as you describe you may decide to use one of the user exits of the inbound IDoc function to code the desired mapping.
If you have to do more complicated mappings, I suggest to build a wrapper function for the IDOC_INVOIC_INVOIC_xx that does first the transformation and then calls the original function.
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